Review on Diamond Jewelry Shells Gemstones Lapidary Cutting Tools in Industrial Drill Bits by Michael Moonin

Great bits for drilling rock. It's a shame when they fade (every 2nd or 3rd stone) you can't bring them back to diamond dusting, wasteful because I use them so quickly. But the work is great so I can't complain. I've had 2 latches so durability is questionable but again they work better than anything else I've found.