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 1.5mm - 6.5mm x 0.5mm.
19 December 2013
great drill set at a good priceI bought these drills as I have used cobalt drills before but as usual have broken the small ones . I was very impressed with the sharpness and precision when used and they come in a really substantial metal box. The price for the quality is remarkable. Highly recommended