【M35 Cobalt Drill Bit】 the cobalt drill bit set uses cobalt M35 high speed steel as material, this material is reliable and practical, with a long service use, heat and abrasion resistance; The cutting edge of drill bit is hardened and honed, with accurate cutting without shaking ??【Twist Design】 PRECISE 135°SPLIT POINT, gold oxide finish and round straight shanks. Prevent walking, clear chips and particles faster.Produced by precision fully ground which ensures chips move smoothly. ?? 【HSS Drill Bit Set】 HSS cobalt drill bit set for hardened steel with excellent cutting performance.The inserts are hardened and polished for improved sharpness and precise cutting without wobbling. ?? 【Widely Use】 Particularly successful in cutting through hard metals such as stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials.suitable for lithium electric drill, hand electric drill, impact electric drill, etc.; The size is small, please pay attention to use