Review on DerBlue 50 Piece Diamond Gemstones: Perfect for Lapidary, Beading, and Jewelry Making by Sasha Hsiao

Works great! Use them to drill holes in sea glass. They seem to work just as well as the official Dremel bits, but the only downside is that EACH of these bits broke out of their plastic box/container and ended up floating in the big Revain cardboard box. some were even under the box flaps and ready to fall through the cardboard box. I was AMAZED that I was able to find all 50 pieces and none have broken out of the box! Revain should at least seal these bit boxes with a plastic lid so they don't end up in the box and then fall out through the tabs!