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Best Choice Mengshen Mengshen Forstner Drill Bits 15-35mm 16PCS, Carbon High Speed Steel Woodworking Hole Saw Punching Bit Wood Slabs Flat Wi Advanced technology manufacturing and durable material - Made from Tungsten steel and being hot-treated, the blade is chVearter Vearter 16PCS Forstner Drill Bit Set, 6-54mm High Carbon Steel Multi-Tooth Woodworking Tools with Round Shank, Hole Saw Popular Sizes - 6mm, 10mm, 12mm, 16mm, 19mm, 22mm, 28mm, 32mm, 35mm, 38mm, 41mm, 45mm, 48mm, 51mm and 54mm. Each bit comMeichoon Meichoon Forstner Drill Bit Set 15-35mm 16 Pcs, Carbide Forstner Bits High Speed Steel Wood Tool Punching Bit Wood Slabs Advanced technology manufacturing and durable material - Made from Tungsten steel and being hot-treated, the blade is chYUENTOEN YUENTOEN 5Pcs Hex Shank Forstner Drill Bit Set, Positioning Woodworking Hole Opener Set with Adjust Depth, Woodworking H Quality Material: This Forstner Bit Set is made of high quality tungsten carbide , hardened steel, tough and long-lastinBest Value Mengshen Mengshen Forstner Drill Bits Set 30-60mm 6PCS, Flat Wing Drilling Hole Hinge Cemented Carbide Carbon High Speed Steel Wo Material - Made from tungsten steel and being hot-treated, the blade is characterized by high accuracy, smooth cutting oMeichoon Meichoon Upgraded Version Multi-Tooth Forstner Drill Bit Set Higher Hardness Hole Saw Auger Opener Woodworking Drilling 【Advanced technology manufacturing and durable material】 Made of Tungsten steel and being hot-treated, the blade is charWYJREES 15pcs Forstner Bit Set Woodworking Drill Bit Set Carbide Steel Forstner Drill Bits Woodworking Hole Saw Cutter Wood Tool Premium Material:lehom forstner bit set is made of excellent carbon steel with high hardnessIRWIN Irwin Marples Forstner Bit Set, Wood Drilling, 8 Piece (1966892) Product Type: Drill BitsMakita Makita D-47363 Standard Forstner HSS Drill Bit Kit 5 Pieces Suitable for precise drilling and high quality finish into woodCreate idea Create idea 6Pcs Woodworking Double-Edged Forstner Drill Bits Kit 3/4/5/6/7/8mm Right-Hand Positive Rotation Drill Bit W Drilling diameter: 3/4/5/6/7/8mm; shank size: 10mm; drilling depth: 40mm; total length: 70mm. Right-Hand Positive RotatiMeichoon Meichoon 75mm Forstner Drill Bits Flat Wing Drilling Hole Hinge Cemented Carbide Carbon High Speed Steel Woodworking Dri ★ High Quality - Small incision resistance, improve the opening speed, chip easy and no tremor. The perforation is neat,15% Off IRWIN IRWIN Marples Forstner Bit Set, Wood Drill Bits, Made of Carbon Steel, Ideal for Fine Woodworking, Cabinet-making and mo Easily drills high-quality flat-bottomed and pocket holesIhvewuo 5pcs Forstner Drill Bits Kit 15-35 mm Flat Wing Hinge Boring Bits Set with Depth Stopper Cemented Carbide Woodworking Ho [Depth Stopper Design] Our flat wing forstner drill bits are designed with depth stopper, which can be fixed on the shanMeichoon Meichoon Forstner Bit Set Wood Drill 15-35mm 5pcs Carbide Forstner Bits High Speed Steel Flat Wing Drilling Hole Hinge C Good Material - Made from tungsten steel and being hot-treated, the blade is characterized by high accuracy, smooth cutt23% Off Baladonia Baladonia Forstner Bit Set of 15 Metric HSS Sawtooth It is superior bits for drilling woodMeichoon Meichoon Forstner Drill Bits 15-35mm 5 Pcs Set, Carbide Forstner Bits High Speed Steel Flat Wing Drilling Hole Hinge Cem High-speed steel woodworking hole saw open hole neat, smooth, no tremor can sharp cutting edge improves opening speed, eFisch Fisch 5-Piece Wave Cutter Forstner Drill Bit Set, Includes Metric Sizes 15-35mm, Made in Austria, FSA-134398 Includes 5 bits 15-35mm in diameterBlulu Blulu 3 Pieces Forstner Drill Bit Triple Flute Wood Drilling Set, 2", 2-1/2", 3" Carbide Tipped Forstner Bit Set for Sol Quality Materials: this forstner drill bit set uses carbide blades with a hardness of HRA92 or above, which is sharp andVearter Vearter 6mm Forstner Drill Bit, High Carbon Steel Multi-Tooth Woodworking Tools with Hex Shank, Hinge Boring Hole Cutter Product Specifications - Diameter 6 mm, total length 94 mm. Equipped with plastic storage caseMAZING MAZING 8PCS Forstner Drill Bit Set for Woodworking, Auger Opener Round Shank Drilling Cutting Tool Set, Alloy Steel Fors High-Quality Alloy Steel: The MAZING Forstner bits are crafted from sharp, high-quality Alloy steel and undergo overallEinhell Original Einhell M-CASE 5-Piece Forstner Drill Bit Set (Made of C65 Steel, E 6.3 Shank, Cross Cut, Centre Point, Conical HIGH EFFICIENCY - The 4-sided closed pre-cutting edge of the Forstner drill bit set allows for even material removal andFreud Freud 7 Pcs. Precision Shear Precision Shear Serrated Edge Forstner Drill Bit Set 1/4 In. to 1 In. (PB-107B) This set contains the seven smallest sizes of our Precision Shear Forstner BitsYUENTOEN YUENTOEN 5Pcs Forstner Drill Bit Set, 16-25mm Hex Shank Carbide Woodworking Hole Saw Wood Cutter Tool for Wood Plastic P High Quality: The wood forstner drill bit is made from high quality carbide and being hot-treated, to increase its highFulasun 5pcs Forstner Drill Bits Kit 15-35 mm Flat Wing Hinge Boring Bits Set with Depth Stopper Cemented Carbide Woodworking Ho ✨【Superior Cemented Carbide】 This hinge drill bit set is made of high quality cemented carbide, and the blade is charactTopHomer (19 mm) Woodworking Forstner Drill Bit Set, Carbide Alloy Steel Hole Saw Opener for Hinge Hole Drilling & Drilling, Dura Complete specifications: these alloy openers for woodworking are available in a range of sizes, with hole sizes from 16-Freud Freud PB-104 Precision Shear 4 Piece 1/4-Inch to 1-Inch Serrated Edge Forstner Drill Bit Assortment Razor-sharp serrated edgesPORTER-CABLE PORTER-CABLE PC1014 Forstner Bit Set, 14-Piece Optimized cutting angles for flat bottom holesvaluehall ValueHall 16 PCS Carbide Steel Forstner Drill Bits Set 15-35mm Woodworking Boring Bit Hinge Hole Saw Cutter V7036-2 1.Material: Made from Tungsten steel with heat treatment. If you think the blades are not very sharp, you can sharpen thHilka 16 PC FORSTNER BIT Set Set includes one forstner bit of each size from (6mm), (10mm), (13mm), (16mm), (19mm), (22mm), (25mm), (28mm), (32mm), (Famag FAMAG Bormax 2.0 WS Forstner Drill Bit Set 3-Piece Diameter 40/50 / 60 mm in Wooden Box The Bormax Forstner drill bit made of alloyed tool steel in premium qualityCMT CMT 537.000.12 12-Piece Forstner Bit set, 10-12-14-15-16-18-20-22-25-26-30-35mm Diameters, 8-10mm Shank Made of super strength alloyed steel (SP).Bestgle Bestgle 5 Pcs Forstner Drill Bit Set Hinge Boring Drill Bit Woodworking Hole Saw Bits Self Centering Plug Auger Opener T You will get 5 Pcs forester drill bit set come with 15mm/20mm/25mm/30mm/35mm to meet different needs.Bosch Accessories Bosch Professional 5-Piece Forstner Drill Bit Set (for Wood, Diameter 15/20/25/30/35 mm, Length 90 mm, Drill Accessories Longer service life: the tooth-shaped design ensures less friction and heatASNOMY ASNOMY 1/4" Inch Carbide Forstner Drill Bit, 6mm Carbide Tipped Forstner Bit for Hard Wood, Wood Drilling Hole Saw Set W 【Top Quality】Made from high quality Tungsten Carbide Tipped Cutters, solid hardened steel body, ensuring its high hardne28% Off Meichoon Meichoon Forstner Drill Bits Woodworking Tool Punching Bit Wood Slabs Flat Wing Drilling Upgraded Version 3-Cutter Highe 【Special Design】 3-cutter Forstner drill bit has faster cutting speed and longer service life. With these sharp drill biEZONEDEAL EZONEDEAL 5PCS forstner bit Set /15-35mm High Carbon Steel Long Round Shank Hinge Hole Cutter Drill Bit Set for Wood Pla Specific Design: Ultra-sharp cutting edge designed for cutting woods smoothly and efficiently.Fisch Fisch FSA-367192 7 Piece Black Shark Forstner Drill Bit Set Blister Pack Includes Bits from 1/4-inch up to 1-inch Diamet PREMIUM FORGED STEEL: Constructed from high-quality forged steel, these drill bits offer exceptional durability and resiGeneric Woodworking Wood Drilling Countersink Drill Bit Hole Puncher Adjustable Depth Forstner Bit with Optional Edges Banding P 💝【Premium s】: The complete set of tools is carefully d from fine-quality s, resistance and with long durability, sufficMengshen Mengshen Forstner 6-60mm Step Drill Bits Spiral Groove 12 Steps Sizes, Large HSS Cobalt Cone Drilling Tool Hole Cutting, HSS & Titanium Coating - High speed steel makes it last longer than others, titanium coating ensures easily cut throughYakamoz Yakamoz 5Pcs 15-35mm Dia. Carbide Forstner Drill Bit Set Hinge Hole Saw Cutter Wood Slabs Flat Wing Boring Drill Bits Au 5 Different Cutting Diameter for your choice: 19/32" (15mm), 25/32"(20mm), 1" (25mm), 1-3/16" (30mm), 1-3/8" (35mm)SENRISE Forstner Drill Bits MASO Woodworking Hole Saw Cutter 53mm Dia Hinge Boring Drilling Bit Hole Saw Cutter for Wood Plastic ★ Product Name : Hinge Boring BIt;Suitable for : Wood Cutting.WORKPRO WORKPRO 9-Piece 1/4" Hex Shank Drill Bit Set, Titanium Plating HSS Drill Bits from 1/16" to 3/8" for Metal, Steel, Wood, Set Includes: 9 commonly used sizes, including 1/16", 3/32 ", 1/8 ", 5/32 ", 3/16 ", 7/32 ", 1/4 ", 5/16", and 3/8", whiFisch 16-Piece Fisch Wave Cutter Forstner Bit Set, Metric Wave Cutter Forstner Bits; 16 Piece Set in Wooden Box: (mm) 12, 15, 16, 18, 20, 22, 24, 25, 26, 28, 30, 35, 38, 40, 45 &STEELEX Steelex D2852 1-1/16-Inch Forstner Bit 1-1/16 inch diameterVearter Vearter 51mm Forstner Drill Bit, High Carbon Steel Multi-Tooth Woodworking Tools with Round Shank, Hinge Boring Hole Cut Product Specifications - Diameter 51 mm, total length 95 mm. Equipped with plastic storage caseBestgle Bestgle Concealed Hinge Jig Kit, Woodworking Tool, Drill Bits, Hinge Drilling Hole Router Jig for Cabinet Cupboard Door Efficient and Precise Drilling: Speed up your drilling process by 50% compared to traditional methods with this 35mm hinuxcell uxcell Forstner Drill Bit 1/4"(6mm) Dia High-Speed Steel Forstner Punching Bit with Round Shank for Hard Wood Soft Wood Size - Drilling Diameter: 6mm / 1/4"; Shank Diameter: 8mm / 0.31"; Total length: 93mm / 3.66"; Surface Treatment: PolishFestool Festool Forstner Drill Bit Set FB D 15-35 CE Set (with FB D 15 CE, FB D 20 CE, FB D 25 CE, FB D 30 CE, FB D 35 CE), in S Drivers for easy change of tips and pilot drilleMagTech eMagTech 35mm Hinge Drill Bit 35mm Forstner Drill Bit Hinge Cutter Power Tools Accessories for Drill Press Bench Drill V The Hinge Drill Bit is made of cemented carbide, solid hardened steel body, ensuring its high hardness, rust proof, sturuxcell uxcell Forstner Drill Bit 25/64"(10mm) Carbon Steel Multi-Tooth Wood Drilling Forstner Bit Hinge Cutter with 1/4" Hex Sh Size - Drilling Diameter: 10mm / 25/64"; Shank Diameter: 6.35mm / 1/4"; Total length: 93mm / 3.66"; Shank Type: Hex ShanFreud Freud FB-100 16PC Diablo Forstner Drill Bit Set Ideal bits for drilling in plywood, hard wood, and soft wood with handheld drills and drill pressesuxcell uxcell Forstner Drill Bits 80mm, Tungsten Carbide Wood Hole Saw Auger Opener, Woodworking Hinge Hole Drilling Boring Bit Forstner Drill Bit: Drilling diameter: 80mm / 3.15"; shank size: 10mm / 0.39"; drilling depth: 54mm / 2.13"; total lengtuxcell uxcell Forstner Drill Bit 33mm (1-5/16") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Woodwo Size - Drilling diameter: 33mm / 1-3/8"; shank size: 10mm / 25/64"; drilling depth: 60mm / 2-3/8"; total length: 90mm /Bosch Bosch 2608577006 drill toothed 20mm Forstner Bits Diameter: 20MFisch Fisch FSA-375005 16 Piece Black Shark Forstner Drill Bit Combo Set Custom Wooden Box Includes Bits from 15mm up to 35mm PREMIUM FORGED STEEL: Constructed from high-quality forged steel, these drill bits offer exceptional durability and resiuxcell uxcell Forstner Drill Bits 17mm, Tungsten Carbide Wood Hole Saw Auger Opener, Woodworking Hinge Hole Drilling Boring Bit Forstner Drill Bit: Drilling Diameter: 17mm / 0.67"; shank size: 8mm / 0.31"; drilling depth: 60mm / 2.36"; total lengthTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 13mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designuxcell uxcell Forstner Drill Bits 38mm, Tungsten Carbide Wood Hole Saw Auger Opener, Woodworking Hinge Hole Drilling Boring Bit Forstner Drill Bit: Drilling diameter: 38mm / 1.5"; shank size: 9mm / 0.35"; drilling depth: 50mm / 1.97"; total length:Torquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 14mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designFisch Fisch Brad Point Drill Bits (12mm x 151mm) - Premium Drill Bits for Soft, Hard, Veneered and Laminated Wood, MDF and Acr Optimized spurs insure fast and easy cutting of the wood fibers before the hole is drilledTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 15mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner design21% Off HARFINGTON HARFINGTON Forstner Drill Bit 59mm (2-5/16") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Wo Size - Drilling diameter: 59mm / 2-3/8"; shank size: 10mm / 3/8"; drilling depth: 60mm / 2-3/8"; total length: 90mm / 3-uxcell uxcell Forstner Drill Bit 52mm (2-1/16") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Woodwo Size - Drilling diameter: 52mm / 2-1/16"; shank size: 10mm / 3/8"; drilling depth: 60mm / 2-3/8"; total length: 90mm / 3Torquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 12mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designuxcell uxcell Forstner Drill Bits 23mm, Tungsten Carbide Wood Hole Saw Auger Opener, Woodworking Hinge Hole Drilling Boring Bit Forstner Drill Bits: Drilling diameter: 23mm / 0.91"; shank size: 7mm / 0.28"; drilling depth: 49mm / 1.93"; total lengtFreud Precision Shear Serrated Edge Forstner Drill Bit 7/8-Inch by 3/8-Inch Shank Quality Forged Construction for extended lifeBosch Home and Garden Bosch 2609255287 90mm Forstner Drill Bit with Diameter 25mm 25mm head sizeuxcell uxcell Forstner Drill Bit 75mm (2-15/16") Tungsten Carbide 2 Cutters Wood Forstner Bit Opener for Hinge Hole Drilling Wo Size - Drilling diameter: 75mm / 2-15/16"; shank size: 10mm / 3/8"; drilling depth: 53mm / 2-3/32"; total length: 85mm /uxcell uxcell Forstner Drill Bit 37mm (1-15/32") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Woodw Size - Drilling diameter: 37mm / 1-15/32"; shank size: 10mm / 3/8"; drilling depth: 60mm / 2-3/8"; total length: 90mm /HARFINGTON HARFINGTON Forstner Drill Bit 27mm (1-1/16") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Wo Size - Drilling diameter: 27mm / 1-1/16"; shank size: 8mm / 5/16"; drilling depth: 60mm / 2-3/8"; total length: 90mm / 3uxcell uxcell Forstner Drill Bit 65mm (2-9/16") Tungsten Carbide 2 Cutters Wood Forstner Bit Opener for Hinge Hole Drilling Woo Size - Drilling diameter: 65mm / 2-9/16"; shank size: 10mm / 3/8"; drilling depth: 55mm / 2-3/16"; total length: 85mm /HARFINGTON HARFINGTON 2 Pcs Forstner Drill Bit 12mm (15/32'') Dia YG8/C1 Tungsten Carbide Twist Wood Forstner Bits Hole Saw Auger O Size - Drilling diameter: 12mm / 15/32"; shank size: 6.35mm/ 1/4"; drilling depth: 45mm / 1-25/32"; total length: 125mmuxcell uxcell Forstner Wood Boring Drill Bits 26mm 27mm Dia. Hole Saw Carbide Alloy Steel Tip Round Shank Cutting for Hinge Ply [Radian Cutter] Removing the chips smoothly and working efficiently with radian curved design.Meichoon Meichoon Forstner Drill Bit 5 Pieces 15mm 20mm 25mm 30mm 35mm Carbon Steel Adjustable Positioning Woodworking Hinge Hole ★ Premium Quality - The positioning woodworking hole opener set is made of high-grade hard alloy, with high strength, weTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 22mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 18mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designDEWALT DeWalt Forstner Drill Bit, 51 mm For clean and precise drillings in hard and soft woodVGOL VGOL 19mm Extra Long High Carbon Steel Bit Extension Triangular Shank Compatible with Forstner for Additional Extension Easy Installation: Our drill bit extender is designed for easy installation, featuring two set screws and a matching hexMeichoon Meichoon Forstner Drill 6-60mm Step Drill Bit Spiral Groove 12 Steps Sizes, Large HSS 4241 Cobalt Cone Drilling Tool Hol HSS & Titanium Coating - High speed steel makes it last longer than others, titanium coating ensures easily cut throughTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 25mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 20mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 19mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designuxcell uxcell Forstner Drill Bits 65mm, Tungsten Carbide Wood Hole Saw Auger Opener Woodworking Hinge Hole Drilling Boring Bit Specifications: Drilling dia.: 65mm; shank size: 10mm; drilling depth: 50mm; total length: 80mm. Hex shank, cemented carMengshen Mengshen M35 Step Drill Bit 4-20mm, Cobalt Spiral Groove Large Bit Pagoda Step Drill Bit Set Hole Reamer Triangle Handle Much More hardness - M35 High speed steel makes it last longer than others, cobalt ensures easily cut through steel sheeBosch Professional Bosch Professional 2608577010 Forstner Bit (for Wood, Ø 26 mm, Length 90 mm, Drill Accessories), Silver/Black Longer lifetime: The tooth-shaped design reduces friction and heatuxcell uxcell Forstner Drill Bits 60mm, Tungsten Carbide Wood Hole Saw Auger Opener, Woodworking Hinge Hole Drilling Boring Bit Forstner Drill Bit: Drilling Diameter: 60mm / 2.36"; shank size: 10mm / 0.4"; drilling depth: 60mm / 2.36"; total lengthTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 40mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designIVY Classic IVY Classic 46152 4-Inch Forstner Bit Extension, High Carbon Steel, 1/Tube Extends any Forstner shank bit an additional 4 inches, Swift Bore (Registered Trademark)DEWALT DeWalt Forstner Drill Bit, 35 mm For clean and precise drillings in hard and soft wooduxcell uxcell Forstner Drill Bit 63mm (2-1/2") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Woodwor Size - Drilling diameter: 63mm / 2-1/2"; shank size: 10mm / 3/8"; drilling depth: 60mm / 2-3/8"; total length: 90mm / 3-Torquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 54mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designTorquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 60mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designDEWALT Dewalt DT4590-QZ Forstner Drill Bit 117mm Special drill bit made with a high percentage of carbon steeluxcell uxcell Forstner Drill Bit 78mm (3-1/16") Tungsten Carbide Wood Forstner Bit Opener Cutter for Hinge Hole Drilling Woodwo Size - Drilling diameter: 78mm / 3-1/16"; shank size: 12mm / 15/32"; drilling depth: 60mm / 2-3/8"; total length: 90mm /Torquata Torquata Tungsten-Carbide Forstner Boring Drill Bits 24mm Diameter 10mm Shank Tungsten-carbide-tipped wood boring drill bits, in a time-tested forstner designFisch Fisch 5/8-Inch Diameter Black Shark Forstner Bit | FSA-350439 Cylindrical shank with 3 clamping surfacesCVIUYO CVIUYO Forstner Drill Bit, 2 Inch Carbide Tipped Forstner Bit for Hard Wood, Wood Drilling Hole Saw, Woodworking Hinge C [Widely Applications] The sharp drill bit can be used for drilling holes on on wood and plastic products, furniture, dooCMT CMT 537.200.31 Forstner Bit, 20mm (25/32-Inch) Diameter, 8mm Shank 3-35/64-Inch Overall Length, Right-Hand Rotation.TREND Trend 1307/38WS Saw FORSTNER 3/8 INCH Dia Saw tooth Forester bits are made from high grade carbon steel and meticulously heat-treated.Larouoba Larouoba 10Pcs 6mm Dry Diamond Drill Bits Set, 1/4 Black Diamond Core Drill Bits for Tile Ceramic Granite Marble Porcela 【Unique Cooling Wax】Diamond Drill Bit integrated with wax lubricant inside which melts while dry drilling and cools the