20 Pcs Glass Engraving Bits Diamond Rotary Tool Bits Precision Stone Carving Tools 120 Grit Rock Carving Tools for Stones Rock Engraving Bits Compatible with Dremel Engraving Bits

Good tool

I bought these to drill holes through my sister's assorted glass creations. They work very well with no issues. I put them in water and then drill the hole so they don't heat up and crack the glass.

I used these on stone and they worked beautifully! They glided seemlessly over the surface and were easy to control.

I have not yet used all the shapes, but the one I used on glass worked well.

Used one of the bits several times and it does the job. Let the speed of the dremel and the do the work, ie only use light pressure.

Needed these for a project - grinding some cement out on a memorial...did the job!

My granite counter top cracked and fell apart. I epoxied the pieces together. Every piece fitted except the last one. I tried to grind it down with aluminum oxide ball with Dremel but it could not make a dent. I got this grinding kit and it worked like a charm. The tool bag says you have to use them with water so that's the only caveat.

I just opened and used the first bit. I used it as directions stated, use wet and at an angle. I had to stop after approx 1 minute into shaping this stone, because it didn't seem to be doing what it's supposed to do. The bit was bare, flat, smooth! Sending these back ASAP