Titanium Nitride
Gold coating that reduces bit friction
Episodes
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#5101: Drill Bits and Concrete: What Actually WorkedA 12V drill, a $20 bit set, and a reinforced safe room wall — what actually happened, and why the first bit failed. -
#3863: Mohs Scale to Dremel Bits: What to Buy FirstFrom Friedrich Mohs to your Dremel: what hardness means for engraving wood, metal, glass, and stone.