Cobalt Drill Bit Set Twist Jobber Length for Hardened Metal Stainless Steel. Material: 6542 high speed steel plated with titanium. Characteristics: high hardness, wear-resistant, accurate positioning, good chip removal, high efficiency. Use: used for stainless steel, chrome steel, square tube and other materials to open the hole work. 6542 high speed steel titanium plating 6542 high speed steel titanium plating, higher hardness and more durable. 118°double rear angle drilling fast CNC precision grinding double rear angle, sharper cutting, faster drilling speed. Wider chipformer to prevent burning Fast chip removal, effectively preventing burned tools due to heat buildup. Universal shank clamping fastening Specification 12-16mm shank diameter is 10mm, other are 12.7mm. Please allow slightly longer for weekends and national holidays. Please fill out all the necessary information on this page and also give as much additional information as possible as to why you wish to return this item.