Specification Brand : HUAZHICHUN BulletPoint1 : MATERIAL: M42 8% Cobalt Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life. BulletPoint2 : SIZE : Metric 4.0mm , 3 Steps Desigh for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic BulletPoint3 : PACKAGE: 10pcs Each pack,This Cobalt Drill Bit is Typically Capable of Running Three to Five Times Faster.So It Can Produce Many More Holes. BulletPoint4 : HRC: 67-70HRC, The Sufficiently Sharp Bit Edge Can Cut the Metal Material into Long Strips of Iron Chips rather than Slowly Grinding Throng the Material with a Blunt Drill Bit. BulletPoint5 : FEATURES:With a cobalt content of 8%, cobalt improves the bit's high-temperature and abrasive resistance. Stainless steel is usually machined with the M42 bit for small size drill bits because the M42 bit has higher strength, higher hardness, better toughness and is less likely to break. It's the best material in the drill! CuttingAngleString : 135 degrees FinishType : Titanium IncludedComponents : 4.0mm 10pcs ItemName : HUAZHICHUN 10PCS Size 4.0mm,M42 8% Cobalt,drillbit,Metal Drill bits for Steel,Drill bits Sets, ItemTypeKeyword : threaded-shank-drill-bits Manufacturer : Xuzhou Huazhichun CNC Technology Co., LTD Material : 高速钢 NumberOfItems : 200 PartNumber : 4.0mm ProductDescription : drill bits for nails,drill bit set,cobalt drill bit set,drill bits for hardened steel,makita drill bit set, ProductSiteLaunchDate : 2022-11-22T03:06:16.128Z SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 SurfaceRecommendation : Aluminum,Metal,Metals,Plastic,Stainless,Steel UnitCount : 5 UnspscCode : 27111700