20Pcs Diamond Mounted Point, 6mm Ball Head, 3mm Shank, Diamond Grinding Bit Rotary Burrs, for Jade Stone Jewelry Ceramic Carving Polishing

As an artist this item was of great use. Drawback was that .. well none really works great.

These were the worst bits I have ever ordered. My normal carrier was out so I thought I would try these out. None of them have enough diamond dust to even make a good mark in the glass. One didn't have any diamond dust at all. The rest at least look like they might work but they didn't work well enough to even continue to use.

For the price these diamond bits can't be beat. I do advise using water to cool the bits down if using on glass or mirror. I usually use them on drinking glasses & mirror, this was a first on tempered auto glass. I will continue to order these in the future.

Used them on aluminum and didn't dull or clog.

I just think the quality isn't that great, tends to wear down after a few uses

I etch glass as a hobby. These work great and last as long if not longer than more expensive versions

I order a lot of these for stuff I make these were almost unusable. It cut for about litterally 15 seconds and the whole thing was bald and useless. Do not but these

Dulls pretty quick.