Stone Carving Set Diamond Burr Bits Compatible with Dremel, 50PCS Polishing Kits Rotary Tools Accessories with 1/8’ Shank For Carving, Engraving, Grinding, Stone, Rocks, Jewelry, Glass, Ceramics

They really works

Very nice. Good price. Lots of bits. Good quality. Used only once so far but worked fine.

These are quite nicely made, they run true to the shaft and do not wobble at any speed. I am using them for work on ceramics, so not a tremendous strength test, but I do like the way they do exactly what I bought them for. I am using them both in a portable dremel and a flexible shaft hang-up grinder.

Diamond coating wore off pretty quickly. Used on mostly chalcedony rocks. But while the coating was on they worked great

If you don’t use water, they don’t last long when cutting rocks (specifically chalcedony - Ellensburg blue). But for the price, not too bad.

I use these for grinding very hard rocks (agates). They have no problem on the rocks and last quite a while before they lose their grit. I've already bought two sets, and will continue to buy these.

So glad I got these. Makes drilling my rocks so much easier. Good quality. They work great with my drill. Lots of sizes to use. Love them.

Got these to use with my tumbled rock. First attempt to drill a hole through to make some jewelry. Could not get it to penetrate the rock, was using with my Dremel and the bit bounced around at the start because I was having a hard time. Thought I had ruined the stone and expected to see it scratched up. But no fear, it left absolutely no marks. Tried with several other stones of different hardness value - still nothing. Got a bit from a different set, same Dremel, same speed, no problem putting in the small hole I needed. After using, ran my finger on the drill bit and it was very smooth. Very disappointing as I was excited or the variety of bits. Returning these, do not recommend.