8 Pack Diamond Drill Bits Set for Tiles Granite Ceramic Marble Stone Glass Hard Materials Dry Drilling, Size 5mm, 6mm, 8mm, 10mm 12mm, Round Shank

The kit contains 8 drill of different sizes. I wanted to drill through stones (+/-2 inches). I did as I saw on utube and it works perfectly and doesn't wear down the bits. I put the stone in a small bowl, cover the stone with water and drill. I take out the debris frequently and it works. I did 3 stones with one drill bit and it still works.

Had gotten these to drill through porcelain. You’ll only get about 20 holes before it’s done, but only takes about 45 seconds to drill versus what feels like 45 minutes a hole on regular tile bits.

Finally got the item, thank you.

I used one bit to drill 20+ holes in porcelain tile for a new shower install and no issues. There seems to be some wax in the hole to help with cooling, but I’d recommend keeping the bit wet. Drill on slow setting worked best. I’ve used a tile bits from other brand name manufacturers and these lasted longer.

Used this set to drill holes through interior rock veneer to hand a commercial sign. I was able to drill through without any issues. Truth be told my drill died before these bits did.Quality- Yes!Value - Yes!Easy to use - Yes!Speed - depends on the user, but these have bite if you follow the instructions!