Specification Brand : KURSTOL BulletPoint1 : 【Package Includes】1pc 9 Step Drill Bit:Covering Sizes:1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4",Quick Change shank/Hex shank size :1/4",Step Height:5MM ,Total height 73MM BulletPoint2 : 【4-Blade Slotted Design】PERFECT for drilling in stainless steel(Thick:1/8").Also suitable for drilling metal plates, aluminum plates, copper plates, wood, plastics, etc.Firmer cutting, higher drilling accuracy, faster drilling, better chip removal. BulletPoint3 : 【M35 HSS Step drill bits&TiAlN Coating】Ultra-high temperature heat treatment and Surface TiAlN coating treatment.Higher hardness, higher wear resistance and durability. BulletPoint4 : 【Wide Application】Suitable for hand drill, table drill, please use flat drill mode, DON'T use impact and hammering mode;Recommended speed: 2000-5000RPM. BulletPoint5 : 【Service】We provide replacement and 100% refund services, if you encounter any problems please contact us, we will give you a satisfactory solution! CuttingAngleString : 118 degrees ExternallyAssignedProductIdentifier1 : 039564191688 ExternallyAssignedProductIdentifier2 : 0039564191688 ExternallyAssignedProductIdentifier3 : 00039564191688 FinishType : Titanium GpsrSafetyAttestation : 1 ItemName : KURSTOL Step Drill Bits M35-1/4"-3/4" Four Spiral Flute Cobalt Step Drill Bit 1/4" Quick Change Shank/Hex Shank High Speed Steel Drill Cone Bits for Metal Aluminum Stainless Steel Wood Plastic ItemPackageDimensions_Height : 8.9916 centimeters ItemPackageDimensions_Length : 2.9972 centimeters ItemPackageDimensions_Width : 3.2004 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : step-drill-bits Manufacturer : KURSTOL Material : Cobalt-containing High-Speed Steel ModelNumber : W9004 NumberOfFlutes : 4 NumberOfItems : 1 NumberOfPieces : 2 PackageLevel : unit PartNumber : K2920034402 ProductDescription : 1. High-quality M35 cobalt-containing high-speed steel material: The material has undergone ultra-high temperature heat treatment and surface TiAlN coating treatment. It has high hardness, high wear resistance, and durability; it is a sharp tool for processing stainless steel plates and various metal plates; 2. 4-edge grooving design: The 4-edge step drill is more stable when cutting, the drilling accuracy is significantly improved, the cutting speed is faster (high efficiency) when drilling, the chip removal effect is also better, and it is unique for stainless steel drilling. Effect; 3. TiAlN coating: Industrial grade aluminum titanium nitride coating with a coating hardness of 89HRC3, which can provide excellent heat protection, wear resistance and corrosion protection; 4. Wide range of uses: Step drills include various sizes and are suitable for drilling needs in a variety of materials and different diameters; Precautions: 1. Suitable for hand electric drills and bench drills; 2. It is recommended to use cutting oil or water cooling during continuous cutting, which can greatly extend the service life; 3. The drilling mode can only use the flat drilling mode, and the impact and hammering modes cannot be used;