Specification Brand : NACX BulletPoint1 : Cutting Diameter: 18mm / 0.7”, Drill Shank Diameter: 12.7 mm / 1/2”, Overall Length: 150mm / 5.9”. Shank Type: Round Shank. BulletPoint2 : Materials: Made of high carbon steel, with good wear resistance, strength and toughness, withstand heavy duty operation for long service life. BulletPoint3 : Twist Drill Bit are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. High cutting edge strength, fast cutting speed. BulletPoint4 : Twist Drill Bit is precision ground with geometry of 118-degree split point for quick self-centering penetration and an accurate start that prevents walking and clears chips and particles faster. BulletPoint5 : Suitable for drilling of die steel, I-steel, channel steel, ordinary steel, Angle iron, aluminum copper, wood and stainless steel. Color : Multi Configuration : configuration CustomerPackageType : 1 CuttingAngleString : 118.0 degrees ExternallyAssignedProductIdentifier1 : 008925172901 ExternallyAssignedProductIdentifier2 : 0008925172901 FinishType : Black Oxide GpsrSafetyAttestation : 1 IncludedComponents : 2Pcs Reduced Shank Drill Bit ItemName : NACX 18mm Drill Bit, Reduced Shank, HSS 9341, 1/2" Shank Twist Drill Bit, 2Pcs ItemPackageDimensions_Height : 19 centimeters ItemPackageDimensions_Length : 10 centimeters ItemPackageDimensions_Width : 2.3 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : reduced-shank-drill-bits Manufacturer : NACX Material : High Speed Steel 9341 Material1 : Blend Material2 : Blend Material3 : Blend Material4 : Blend Material5 : Blend ModelNumber : DMD1532JP1 NumberOfItems : 2 NumberOfPieces : 1 PackageLevel : unit PartNumber : K468 Pattern : Solid ProductDescription : Feature: Sharp and spiral cutting edge provides neat and smooth cuts. Black Oxide Finish - Black oxide surface treatment holds up better lubrication for smoother drilling. Wide application for drilling of stainless steel, die steel, I-steel, ordinary steel, Angle iron, rubber, plastic, aluminum, copper, wood, and other materials. Please Note: To make clean and precise holes, water is required for lubrication and cooling when drilling metals. Increased use of water lubrication will extend drill bit life. Use tips: 1, if the drill material is hard, first use a 3-6mm drill bit to make a small hole, and then use a large drill bit to reexpand the hole. 2, drilling hard drill speed should be between 80-120 effect is good, the greater the number of RPM can not drill down, burn the drill bit. 3, because stainless steel contains more alloy components, its hardness and mechanical properties are higher, the need to apply enough pressure and motor power when drilling with a hand drill is large enough, it is easy to use a bench drill. 4, When drilling with cobalt head with equal handle, add water or coolant to cool the drill to prevent the drill bit from burning out..