Diamond Coated Rotary Burrs Set Drill Bits Grinding Wheels Drilling Bits for Wood Glass Jewelry Stone Metal Engraving Carving Grinder Rotary Tools Accessories 3MM Mandrel 120 Grit 50 Pieces

I used a grinding wheel in a Makita 18v drill on the number one setting (slow) to grind some glass into the shape that I wanted and it performed great. I absolutely recommend this product.

Great diamond rotary bits. I've been carving stone with them which has worked really well. 👍

Not bad at all for this price. Most shapes and sizes for regular projects. Used it on granite and it does the job. Grit gets finer with use and less effective but that has been the case with any diamond burr I have ever used. They are true and not wobbly, so all in all very pleased.

Great for working on glass.

I use these for my hobby of engraving drinking glasses. Despite being wrapped fully in bubble wrap, the plastic container was damaged and will not stay closed as a result. The drill bits themselves seem good

There were a few items missing from the package.I'm dissapointed

I bought these to use for glass work.After a single use a lot of the cone shaped bits had become unusable. I had a lot of hope for these given so many great reviews. Potentially the glass I was working with may have been too tough for some of the bits. Some of the other bits I have used so far seem OK. Time will tell

Got the job done, but the heads quickly got ground down.I was using them to cut holes and Etch/ smooth cut glass.Good for a project, but won’t make it to the next one.