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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 1mm.
8 September 2014
Wholly goodThese drills are of excellent quality - out of interest I compared their performance with 'fresh from the packet' standard HSS bits and they won hands down - faster and cleaner holes every time! I obviously don't know yet about longevity, or how they would perform in a production environment, but for me, as a retired tradesman, they represent excellent value for money.
28 October 2010
Amateur bitsThey cut very well into A2 steel , anyway I broke 4 of them in few days of work ,so I'd advise the use of a pillar drill .