Cobalt Drill Bit Set，M35 HSS Metal Drill Bit Set, 135° for Hardened Metal, Stain

Material High Speed Steel (HSS). 【Professional and versatile】: M35 cobalt high-speed steel is more suitable for machining hardened materials. 【High-quality 5% cobalt steel, hardness 63 HRC】This fully ground cobalt drill bit set is made of 5% pure cobalt.

eBay