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  • Atlas Copco Cop Dth Back Hammer - Buy Backhammer,Back ...

    Atlas Copco Cop Dth Back Hammer , Find Complete Details about Atlas Copco Cop Dth Back Hammer,Backhammer,Back Hammer,Back Hammers from Drill Bit Supplier or Manufacturer-Xiamen Bestlink Factory Co., Ltd.

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  • China New Design Cop Rh140 Back Hammer for DTH Drilling ...

    Back Hammer, Cop Back Hammer, Rh140 Back Hammer manufacturer supplier in China, offering New Design Cop Rh140 Back Hammer for DTH Drilling, Hydraulic Stone Pressing Machine to Recycle Granite Waste, Thin Stone Veneer Saw Mighty Stone Cutting Machine Saw with Dual Blades and so on.

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  • China Rock Drill Bit manufacturer, Rock Drill Steel, Rock ...

    3' to 12' Bh140 Bh160 Bh190 High Air Pressure DTH Drilling Back Hammer FOB Price: US 500-1,000 Piece. Min. Order: 1 Piece Contact Now. TOP Hammer Drilling. Video. 32-45mm Top Hammer Stone Quarrying Tool Small Hole Blasting Tapered Rock Drilling Bit ...

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  • Back Hammers - Warrior Drilling

    The Back Hammer is designed to help to free a DTH hammer and drill pipes that have jammed in the drill hole. It can also be used to hammer down or withdraw casings. The Back Hammer is mounted between the rotating unit and the drill pipes. If the rotation unit or drill pipes have another thread size or type, the appropriate adaptors will be needed.

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  • Top Hammer Drilling , DTH Drilling products from China ...

    3' to 12' Bh140 Bh160 Bh190 High Air Pressure DTH Drilling Back Hammer FOB Price: US 500-1,000 Piece. Min. Order: 1 Piece. Contact Now. Video. Quick View. CIR70 CIR90 CIR110 Low Air Pressure DTH Rock Drilling Button Bit for Quarrying FOB Price: US 30-150 Piece. Min. Order: 1 Piece ...

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  • Back Hammer-SANSUNG MINING EQUIPMENT-ROCK DRILLING TOOLS ...

    In case of jamming of any drilling tool in the boring process, the backhammer will help you sace the time and money. The backhammer may be mounted on the drill pipe joint between the borehole gripper and the swivel head, thus creating a combined effect of effective reverse impact and vibration.

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  • Down the Hole Hammers (DTH)

    The optimum range of hole size for DTH drilling is 90 mm (3.5”) to 254 mm (10”). Smaller holes are generally drilled using tophammer drill rigs, and larger holes generally use rotary drill rigs. As a rule of thumb, the smallest hole diameter a DTH hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole ...

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  • DTH Hammers - Drilling Supply Store

    The DTH hammer piston always makes direct contact with the drill bit and there is generally no loss of transmitted energy as the hammer drills deeper, as is the case with drifter (top hammer) rigs. Drilling Supply Store offers a wide range of DTH hammers suitable for a variety of drilling operations.

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  • Back Hammers, Extractor Hammers -- Acedrills Rock Tools

    The Back Hammer is designed to help to free the DTH hammers and drill strings that have jammed in the drill hole. It can also be used to hammer down or withdraw casings. The Back Hammer is a percussion mechanism in which the impact power is conducted backwards.

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  • Drop The Hammer

    The Vitpilen 401 is an unassuming hero of the sub-500 cc world. Its sure footedness, light weight and immersive riding position guarantee helmet-hidden smiles. You don't ride it as much as guide it with feather-light inputs. It reacts to the smallest response, moves at the lightest touch and feeds back every road texture through low-slung bars.

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  • DTH back hammer - tjdrilling.com

    DTH back hammer is a tool that can save and recover a drilling string stuck in a hole . it can be easily fitted in a suitable tube joint between the drill support and the rotation head to provide an effective combination of backward hammering and vibration to loose stuck drilling string

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  • Atlas Copco COP DTH Back hammer-ROSCHEN GROUP ...

    Atlas Copco COP 32 34 DTH Back hammer Backhammers COP Backhammers -- Time and equipment savers! Rock drilling is a demanding business and poor rock conditions are a fact. Being stuck in the hole can result in serious down time, loss of ...

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  • Back Hammers, Extractor Hammers -- Acedrills Rock Tools

    The Back Hammer is designed to help to free the DTH hammers and drill strings that have jammed in the drill hole. It can also be used to hammer down or withdraw casings. The Back Hammer is a percussion mechanism in which the impact power is conducted backwards.

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  • DTH hammer - Zhejiang Miningwell Supply Chain Management ...

    D Miningwell Hot Sale M3 3 Inch Middle Pressure Rock Drilling Mining Bit DTH Hammer DTH Back Hammer. FOB Price: US 163.27-165.32 Piece. Min. Order: 1 Piece. Contact Now. D Miningwell Quality DHD55A 5 Inch High Air Pressure Rock Drilling Used for Water Well Drill Rigs DTH Hammer. FOB Price: US 814.33-816.38 Piece.

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  • High Air Pressure Down The Hole Mining Hammer ...

    High Air Pressure Down The Hole Mining Hammer. We are a leading manufacturer of rock drilling tools, like DTH hammers and bits, DTH drill pipes, RC hammers and bits, top hammer button bits, coupling, cross bits, drill rods. We have rich experience in this field of DTH hammers and bits for 40 years. Roschen produce big size DTH hammer and bits ...

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  • DTH Hammers for sale from China Suppliers

    6 Inch Atlas Copco DTH Hammer Used for Sale(SD6A)/surface drilling FOB Price: USD 500 - 1,000 Set Min. Order: 1 Sets; Surface drilling/4' High Air Pressure DTH Hammer with Foot Valve for popular sale/Mining drilling parts FOB Price: USD 500 - 1,000 Set Min. Order: 1 Sets; pneumatic hammer drill, air compressor hammer rock drill, hammer ...

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  • DTH Hammer

    SH DRILL has been researching rock drilling tools. With over 20 years manufacturing experience, we use the latest technologies in engineering to produce top-quality DTH hammers & bits and reverse circulation hammers & bits, etc. Our rock drilling tools are widely used in earthwork, mining, well engineering and construction engineering ...

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  • COP M-series - The fastest DTH hammers ever

    COP M6. This is the fastest 6' DTH hammer on the market. It covers the most common hole diameters, from 165 mm to 171 mm. COP M7. The 7' hammer is an all-new product, designed to bridge the productivity gap between 6' and 8' hammers. The ideal bit diameters for COP M7 range from 200 mm to 229 mm. Indeed, tests comparing COP M6 and COP M7, using ...

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  • DTH Hammer - DMD40DH Manufacturer,DTH Hammer - DMD40DH ...

    DMD40DH HAMMER. Hammer to Drill a hole of dia108 - 150 mm (41/4 5 7/8 ). DMD40DH is designed for maximum performance at higher pressures, and is also suitable for water well drilling. DHD340bit has a strong robust design with foot valve to withstand heavy duty application. DMD40DH Hammer maximizes energy output and reduces service requirements.

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  • DTH Hammer - DRT10RK Manufacturer,DTH Hammer - DRT10RK ...

    Hammer to Drill a hole of dia227 - 305 mm (9-12 ). DRT10RK is a valve less type hammer designed for high performance at low operating air pressures. Rk1bit has a strong robust design to withstand heavy duty application and it does not use foot valves which reduces the possibility of hammer failure.

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  • Back Hammer for DTH drilling tools - Products

    Back Hammer for DTH drilling tools . Product details. Back Hammer: In case of jamming of any driling tool during the boring process, the back hammer will help you save time and money. The back hammer may be mounted on the drill pipe joint between the borehole gripper and the swivel head, thus, creating a combined effect of effective reverse ...

    Get Price
  • DTH back hammer - tjdrilling.com

    DTH back hammer is a tool that can save and recover a drilling string stuck in a hole . it can be easily fitted in a suitable tube joint between the drill support and the rotation head to provide an effective combination of backward hammering and vibration to loose stuck drilling string

    Get Price
  • China High Quality Down The Hole Back Hammer Suppliers and ...

    Back hammer is a tool that can save and recover a drill string stuck in a hole, it can be easily fitted in a suitable …

    Get Price
  • Atlas Copco COP DTH Back hammer-ROSCHEN GROUP ...

    Atlas Copco COP 32 34 DTH Back hammer Backhammers COP Backhammers -- Time and equipment savers! Rock drilling is a demanding business and poor rock conditions are a fact. Being stuck in the hole can result in serious down time, loss of ...

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  • Atlas Copco Cop Dth Di Nuovo Martello - Buy Backhammer,Di ...

    Atlas Copco Cop Dth Di Nuovo Martello , Find Complete Details about Atlas Copco Cop Dth Di Nuovo Martello,Backhammer,Di Nuovo Martello,Martelli from Drill Bit Supplier or Manufacturer-Xiamen Bestlink Factory Co., Ltd.

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  • DTH HAMMERS - Robit Rocktools - PDF Catalogs

    The Robit® XII QL120 hammer is a valveless DTH hammer designed to operate efficiently at pressures ranging from 7 to 17.2 bar (100 250 psi). The Robit® XII QL120 is supplied with a 6⅝” API regular pin backhead and is fitted with a positive seating check valve as standard. In addition to the standard Hyper 121 button bits, the the Robit ...

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  • Secoroc Rock Drilling Tools Product catalogue – DTH equipment

    Hammer execution Examples: 02 = COP 32-62 hammer 04 = COP Std hammer, DHD shank 06 = COP QM hammer, DHD shank 28 = Gold “Slim“ hammer, QL shank 34 = Gold hammer, QL shank 36 = Gold QM hammer, QL shank 70 = COP 20 Codes for DHD Classic, QL, QLX and TD hammers Example: 9706-05-50-00 = QL 60, 3 1/2' API Reg Type of product 97 = DTH hammers ...

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  • DTH Spare Parts - Quality DTH Hammer Bits & DTH Drill Bits ...

    Heavy Weight DTH Accessories Back Hammer 8 Bar Pressure With API 31/2” Thread Contact Now Get Best Price DTH Spare Partss of back hammer Quarrying and Ore Mining and Well Drilling Description In case of jamming of any drilling tool during the boring process, the back hammer will help you save time and money.

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  • Difference between DTH(Down the Hole) Drilling and Top ...

    Difference between DTH(Down the Hole) Drilling and Top Hammer Drilling December 15, 2017 The reason …

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  • Secoroc Rock Drilling Tools Product catalogue – DTH equipment

    Hammer execution Examples: 02 = COP 32-62 hammer 04 = COP Std hammer, DHD shank 06 = COP QM hammer, DHD shank 28 = Gold “Slim“ hammer, QL shank 34 = Gold hammer, QL shank 36 = Gold QM hammer, QL shank 70 = COP 20 Codes for DHD Classic, QL, QLX and TD hammers Example: 9706-05-50-00 = QL 60, 3 1/2' API Reg Type of product 97 = DTH hammers ...

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  • EVERDIGM ROCKTOOLS DTH BACK HAMMER

    DTH BACK HAMMER Everdigm Rocktools Back Hammer is designed for backward hammering & vibration. When the drill string or hammer is stuck in the hole, you can pull out very easily. Easy fit between the drill string and rotation head with any type of thread. Effective combination of backward hammering & vibration to loosen stuck drill strings.

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  • DTH HAMMERS - Robit Rocktools - PDF Catalogs

    The Robit® XII QL120 hammer is a valveless DTH hammer designed to operate efficiently at pressures ranging from 7 to 17.2 bar (100 250 psi). The Robit® XII QL120 is supplied with a 6⅝” API regular pin backhead and is fitted with a positive seating check valve as standard. In addition to the standard Hyper 121 button bits, the the Robit ...

    Get Price
  • DTH Hammers-Super Cut Tool

    With professional manufacturing experience in DTH hammer production, our factory can supply you with high pressure and medium to low pressure DTH hammers. It strictly matches with API standard and other Chinese industry standards. It is durable for being produced with advanced craftwork and good material.

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  • Manufacturer of DTH Hammers & DTH Spare Parts by AQ Rock ...

    Used in industrial applications; DTH Accessories, DTH Spare Parts, Drilling Rigs, DTH Hammers and DTH Frontcheck, is manufacture, supply, trade and export by us in wide assortment.AQ Rock Drills is a sole proprietorship based company established in the year 1995 in Andhra Pradesh, India. Being a prominent company in the market, we are involved in offering unmatchable quality products to ...

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  • China High Quality Down The Hole Back Hammer Suppliers and ...

    Back hammer is a tool that can save and recover a drill string stuck in a hole, it can be easily fitted in a suitable …

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  • Atlas Copco Flic Dth Dos Marteau - Buy Backhammer,Dos ...

    Atlas Copco Flic Dth Dos Marteau , Find Complete Details about Atlas Copco Flic Dth Dos Marteau,Backhammer,Dos Marteau À Marteaux from Drill Bit Supplier or Manufacturer-Xiamen Bestlink Factory Co., Ltd.

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  • Back Hammers - Bit-Bite

    The Back Hammer is designed to help to free a DTH hammer and drill pipes that have jammed in the drill hole. It can also be used to hammer down or withdraw casings. The Back Hammer is mounted between the rotating unit and the drill pipes. It consists of only five main parts: a protective barrel 6, which houses the piston 4, support ring 5 ...

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  • DTH Hammer, DTH, down the hole Hammer, bit, ring bit, wing bit

    dth hammer The Wildcat DTH Hammers are designed to maximize the usage of supplying compressed air flow, applied most efficient material for each part, precisely machined by state-of-the-art CNC machines, heat-treated in the self-own ultramodern facility and quality-controlled by well-trained engineering experts.

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  • EVERDIGM ROCKTOOLS DTH BACK HAMMER

    DTH BACK HAMMER Everdigm Rocktools Back Hammer is designed for backward hammering & vibration. When the drill string or hammer is stuck in the hole, you can pull out very easily. Easy fit between the drill string and rotation head with any type of thread. Effective combination of backward hammering & vibration to loosen stuck drill strings.

    Get Price
  • Geonex HZR1200

    HZR1200 rig is the biggest and strongest hammer drilling rig on the market. HZR1200 drills up to Ø1220 steel casings, which is the biggest hammer …

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  • DTH Hammers - Drilling Supply Store

    The DTH hammer piston always makes direct contact with the drill bit and there is generally no loss of transmitted energy as the hammer drills deeper, as is the case with drifter (top hammer) rigs. Drilling Supply Store offers a wide range of DTH hammers suitable for a variety of drilling operations.

    Get Price
  • Atlas Copco Flic Dth Dos Marteau - Buy Backhammer,Dos ...

    Atlas Copco Flic Dth Dos Marteau , Find Complete Details about Atlas Copco Flic Dth Dos Marteau,Backhammer,Dos Marteau À Marteaux from Drill Bit Supplier or Manufacturer-Xiamen Bestlink Factory Co., Ltd.

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  • DTH Hammer, DTH, down the hole Hammer, bit, ring bit, wing bit

    dth hammer The Wildcat DTH Hammers are designed to maximize the usage of supplying compressed air flow, applied most efficient material for each part, precisely machined by state-of-the-art CNC machines, heat-treated in the self-own ultramodern facility and quality-controlled by well-trained engineering experts.

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  • Reverse Circulation Hammers & Bits - Black Diamond ...

    Black Diamond's reverse circulation hammers are specifically designed for all kinds of exploration drilling (deep hole and in-pit grade control applications). Whether you are exploring potential sites or working an existing mine, the BDDRILL RC hammer …

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  • Geonex HZR220 - DTH Horizontal drilling rigs and products

    HZR220 is extremely compact unit. It works in small sized infrastructural steel cased and rock drilling needs, with pneumatic percussion down the hole hammer. HZR220 has a wide drilling diameter range capability from Ø139 to Ø219. Wide equipment range enables effective and accurate DTH-drilling.

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  • DTH Hammers factory, Buy good quality DTH Hammers products ...

    Buy low priced DTH Hammers from DTH Hammers factory, We provide good quality DTH Hammers from China. Sales & Support ... mission hammer dth tools CIR 80 CIR 90 Low Air Pressure DTH Hammer. Contact Now. For Water Well dth hammer drilling Big Hole DTH Hammers And Bits. Contact Now.

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  • hammers Archives - International Mining

    The new Cat DTH Hammer is 152 mm (6 in) in diameter and is the first to be introduced in the new DTH line. Its valved design provides reliable operation, low air consumption, easier maintenance and cost effective rebuild, according to the company. The piston design, meanwhile, delivers long life and efficient energy transfer.

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  • DTH Drilling Hammers - 6.5' Digger DTH Hammers ...

    DTH Hammer are designed and produced to provide superior performance and to deliver constant energy behind the bit, and minimize power loss. These are manufactured with special steel and the finest mechanical process and designed to combat with low as well as high pressure rigs. Our DTH …

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  • DTH Power Hammer — Bestma

    209-03 41st Avenue Bayside, NY 11361. Monday - Saturday 8am - 9pm EST

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  • Fluidic DTH hammer with backward-impact-damping design for ...

    The DTH hammer drilling method is generally considered one of the best approaches for drilling hard rocks. A fluidic DTH hammer with backward-impact-damping design for hard rock drilling was proposed in the study. Striking features of this DTH hammer tool include extended life expectancy and capability to withstand drilling fluids solids content.

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  • DTH HAMMER TOOLS,Products - starockdrill.com

    Contact Us. Tel:+86 18039347362. Fax :+86-393 6210082. Mobile:+86-15910895290. E-mail: [email protected] Skype: starockdrill Whatsapp: +86 15910895290

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  • Factory High Quality 3'-5' COP Backhammer - Buy COP ...

    Down The Hole DTH Back Hammer. Bestlink Factory. Xiamen Bestlink Factory Co., Ltd is committed to provide the best drilling and cutting machine, tools and accessories products in marble and granite stone quarrying, as well as in civil engineering application, especial demolition project. it is now a leading manufacturer of cutting and drilling ...

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  • DTH Speedrill — Bestma

    Back. DTH HAMMER CLUSTER HAMMER BITS TRICONE BIT DRILLING RIG ACCESSORY/ATTACHMENT Folder: NEW TECH. Back. MUD HAMMER AIR-MIST HAMMER 수출입 업무 Contact Us Speedrill. Slide 1 Slide 1 (current slide) Slide 2 Slide 2 (current slide ...

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  • Dth hammer maintanence

    DTH Hammer Series UDC Series ... If hammer oil is only added at each rod change, care should be taken to ensure that an adequate supply of oil is maintained to the hammer at the recommended rate. ... Pull back from bottom as far as necessary to prevent the hammer sitting under water. It is also good practice to pour at least half litre of oil ...

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  • Reverse Circulation Hammers & Bits - Black Diamond ...

    Black Diamond's reverse circulation hammers are specifically designed for all kinds of exploration drilling (deep hole and in-pit grade control applications). Whether you are exploring potential sites or working an existing mine, the BDDRILL RC hammer …

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  • Front Page

    Robit focuses on consumables - ensuring you'll get just the right tools, knowledge and support for your operation. Efficient top hammer drilling is widely used in mining, construction and quarrying of rock material. Accurate DTH or down-the-hole drilling is used in construction, quarrying, thermal wells, oil and gas drilling etc.

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  • Low Air Pressure DTH Hammers - sinodrillbit.com

    Brief Introduction of DTH Hammers. Down the hole rock tools (drilling tools) are rock drilling equipment which takes compressed air as power source to partially transfer impact power into drilling holes. An air distributing device in a top hammer controls a piston to move back and forth.

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  • Meeting Rock Drillers’ Needs: DTH Percussive Hammers ...

    DTH Percussive Hammer. Unlike the drifter drill, the DTH hammering action only takes place at the end of the drill string, with little loss of energy. As the high-pressure air passes through the hammer with the button bit pressed against the face of the rock, the piston will hit the back of the bit forcing the bit into the rock.

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  • DHD350 Dth Drilling Tools Hammer Spare Parts Top Sub

    DTH Hammer Spare Parts Top Sub. The top sub is a part of DTH hammer. It connects with drill pipe or connector. KSQ can provide various subs to meet with different shanks of your hammers. For example, DHD, COP, NUMA, QL, SD, etc. DTH Subs Specification.

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  • WATER POWERED DRILLING - LKAB Wassara

    red DTH drilling is the fact that the water hammer has stabilizer ribs along the hammer case. The diameter created by the ribs is matched with the drill bit diameter and can be as tight as Δ 1-2mm to ensure that the hammer is straight aligned in the borehole. The reason this set up is feasible for the water hammer

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  • Precautions For Grinding DTH Hammer Drill Bit - News ...

    Precautions For Grinding DTH Hammer Drill Bit Aug 18, 2021. 1. The cutting edge should be level with the grinding wheel surface. Ensure that when the cutting edge touches the surface of the grinding wheel, the entire cutting edge must be ground.

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  • Geonex HZR400 - DTH Horizontal drilling rigs and products

    Horizontal DTH-drilling rig up to Ø508. HZR400 is a compact and versatile contracting unit. It works in small to medium sized infrastructural steel cased and rock drilling needs, with pneumatic percussion down the hole hammer…

    Get Price
  • Design Optimization and Performance Analysis of the ...

    Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical ...

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  • Hunan New Diamond Construction Machinery Co., Ltd. - DTH ...

    DHD340 high air pressure DTH hammer with foot valve FOB Price: USD 500 Set Min. Order: 1 Sets; DHD350Q High Air Pressure DTH Hammer with Foot Valve FOB Price: USD 500 Set Min. Order: 1 Sets; DHD360 high air pressure DTH hammer with foot valve FOB Price: USD 500 Set Min. Order: 1 Sets; DHD380 high air pressure DTH hammer with foot valve

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  • Precautions For Grinding DTH Hammer Drill Bit - News ...

    Precautions For Grinding DTH Hammer Drill Bit Aug 18, 2021. 1. The cutting edge should be level with the grinding wheel surface. Ensure that when the cutting edge touches the surface of the grinding wheel, the entire cutting edge must be ground.

    Get Price
  • WATER POWERED DRILLING - LKAB Wassara

    red DTH drilling is the fact that the water hammer has stabilizer ribs along the hammer case. The diameter created by the ribs is matched with the drill bit diameter and can be as tight as Δ 1-2mm to ensure that the hammer is straight aligned in the borehole. The reason this set up is feasible for the water hammer

    Get Price
  • Meeting Rock Drillers’ Needs: DTH Percussive Hammers ...

    DTH Percussive Hammer. Unlike the drifter drill, the DTH hammering action only takes place at the end of the drill string, with little loss of energy. As the high-pressure air passes through the hammer with the button bit pressed against the face of the rock, the piston will hit the back of the bit forcing the bit into the rock.

    Get Price
  • DTH-hammer drilling device and overburden drilling method ...

    1. A DTH-hammer drilling device, comprising: a down-the-hole- (DTH-) drilling head with a percussion drill bit; and a drill pipe with a waste conduit for cuttings and at least one supply conduit for a flushing medium, wherein a seal is provided at a fixed distance from the drilling head for sealing the DTH-hammer drilling device against the borehole opening.

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  • Hunan New Diamond Construction Machinery Co., Ltd. - DTH ...

    DHD340 high air pressure DTH hammer with foot valve FOB Price: USD 500 Set Min. Order: 1 Sets; DHD350Q High Air Pressure DTH Hammer with Foot Valve FOB Price: USD 500 Set Min. Order: 1 Sets; DHD360 high air pressure DTH hammer with foot valve FOB Price: USD 500 Set Min. Order: 1 Sets; DHD380 high air pressure DTH hammer with foot valve

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  • Geonex HZR400 - DTH Horizontal drilling rigs and products

    Horizontal DTH-drilling rig up to Ø508. HZR400 is a compact and versatile contracting unit. It works in small to medium sized infrastructural steel cased and rock drilling needs, with pneumatic percussion down the hole hammer…

    Get Price
  • Hard Rock Reaming with the Mincon HDD80 Pull Reaming Hammer

    The Mincon HDD80 Pull Reaming Hammer was installed with a 10” (254mm) reaming bit. Using a polymer and foam mixture along with compressed air to carry the cuttings from the bore production was steady and after 7 hours and 46 meters drilling the tool exited the bore. A second 14” (356mm) reaming bit was then installed and opened the entire ...

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  • Design Optimization and Performance Analysis of the ...

    Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical ...

    Get Price