Axminster Workshop 19 Piece Cobalt/HSS Drill Bit Set

Precision ground from M35 high speed steel bars with 5% cobalt achieving a hardness of some 66-67 Rockwell. Intended for use on alloy and hardened steels, cast iron, titanium and many other really tough, hard-to-drill materials such as stainless steel. Sizes range from 1-10mm x 0.5mm.