Best Drill Bits for Metal for 2021 - Pro Tool Reviews
2020-12-30u2002·u2002Best Drill Bits for Hardened Metal or Steel. Clearly the best drill bits for hardened metal or steel come with a cobalt blend. These cobalt drill bits use an alloy including 5%–8% cobalt. This cobalt makes up part of the steel blend, so the hardness of the bit doesn't wear off with a coating (like titanium bits…
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