Specification Brand : HUAZHICHUN BulletPoint1 : MATERIAL: Cobalt Usually Give the Best Heat,Wear and Chip Resistance and Long Tool Life. BulletPoint2 : SIZE : Metric 1.5/2/2.5/3/3.2/3.5/4/4.5/4.8/5/5.5/6/6.5mm , 3 Steps Desigh for Cutting through Stainless Steel,Hard Metals,Aluminum,Plastic BulletPoint3 : PACKAGE: 13pcs 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! IncludedComponents : 1.5-6.5mm ItemName : HUAZHICHUN M35 Cobalt Steel Extremely Heat Resistant Twist Drill Bits with Straight Shank Set of 13pcs to Cut Through Hard Metals Such as Stainless Steel and Cast Iron ItemTypeKeyword : threaded-shank-drill-bits Manufacturer : Xuzhou Huazhichun CNC Technology Co., LTD Material : 高速钢 NumberOfItems : 200 PartNumber : 13pcs ProductDescription : drill bits for nails,drill bit set,cobalt drill bit set,drill bits for hardened steel,makita drill bit set, ProductSiteLaunchDate : 2022-12-08T02:30:07.048Z SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 SurfaceRecommendation : Cast Iron,Metals,Stainless Steel,Steel UnitCount : 5 UnspscCode : 20121600