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.

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

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.

Junk from China,

These bits cut great on stone and concrete.

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

Dulls pretty quick.

just what I needed