Best Drill Bits for Metal for 2021 | Pro Tool Reviews
2021-7-2 · Metric drill bits sets are equipped with premium M42 cobalt (that is 8% cobalt steel) and 68-70 HRC (Rockwell Hardness Scale)which provides the best heat, wear and chip resistance and also give a long tool life to the bits. Metric drill bit have 3 steps of design which help cutting through stainless steel, hard metals, aluminium and plastic.
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