Diamond Tip Drill Bits, 8-Piece Set

Excellent product

I used them to drill holes in Vermont marble without a problem except for the 3/8 drill bit where I put too much pressure on it and it got bent. I should have been more careful. Otherwise, the other bits drilled the holes perfectly.

Good product. Used to drill lamp conduit holes in beach rocks(lot of granite). So far happy with them.

Shipping was quick and the product was great. Used the 1/4 diamond tip bits for drilling into granite to mount screen brackets. They worked perfectly!