Diamond Drill Bit - BRSCHNITT 1/4 inch Masonry Drill Bits Set for Porcelain Tile Ceramic Stone Granite Marble,Hex Shank Diamond Hole Saw Drill Bit(5pcs/Pack).

Bits work good. Drilled 8 holes in porcelain tile on 1 bit. Kept it wet and cold and didn’t press to hard.

I use these drillbits when I was building a new tile shower. I needed to drill precise holes in the new tile to hang a very heavy shower door. So the holes had to be done right. These bets did the job. I use one bit to start the initial drilling and another one to finish the job. Great product!

Good product based on price and quantity. These drill bits are not durable at all, I used two per hole. Considering the price, quantity, plus free shipping it is a good deal.

I used the drill bits to create drainage holes in porcelain. They worked well without chipping.

they did what they were supposed to do. I drilled through hard porcelain tile without too much problem.

Worked well good performance

These go smoothly through polished porcelain with a little water to cool the bit.

These drill bits make it easy to drill a rock but they do not last very long. It was super useful to make the starting hole and to smooth out a hole in a rock.