. COBALT METAL Drill Bit 14-25.5 mm HSSBLACK-33004. SET OF COBALT DRILLS FOR METAL AND WOOD8 DRILLS IN SIZES 14-25,5MMMulti-task set of drill bits ready for the most difficult tasksA set of drill bits is an indispensable piece of equipment for every home DIYer's garage and professional repair shops. It will be perfect for drilling holes in such materials as:hard alloy and non-alloy steelstitanium and titanium alloysgray and ductile cast irontin bronzetin bronze.zincthermally resistant austenitic steelaluminum bronzestructural steelsstainless and acid-resistant steelsgraphitesintered powder metalswoodThe set is enclosed in a practical wooden case for easy transport and storageCobalt drill bits are among the hardest, toughest and most durable drill bits available on the marketThis makes them applicable as steel drill bits, hard steel drill bits, stainless steel drill bits, or as concrete drill bits. Cobalt metal drill bits are manufactured from chromium vanadium steel high-speed steel with 5% cobalt doping with 1/2" cylindrical shank The cobalt content translates into the ability to use higher cutting speeds with lower feeds.The SET INCLUDES:- 8 drill bits with 1/2'' chuck in sizes:drill 14 mmdrill 15 mmdrill 16 mmdrill 16,5 mmbore 19 mmbore 20.5 mmbore 22 mmbore 25.5 mm- wooden storage case