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1 - The Modding Toolbox: A Guide to Drill Bits 2 - Speciality Bits: Centre Drills and Countersinks 3 - Big Holes: Stepped Drills and Hole Saws Next Hello everybody, and welcome to what I hope will ...

When I was drilling through a hardened steel I went to a specialty metals shop and they recommended cobalt bits. They were also much cheaper than lows but unfortunately have since gone out of business ...