4 Inch Diamond Drill Bits Glass Hole Saw Drill Bit Set for Glass Ceramics Porcelain Ceramic Tile Marble

I'm using this to cut the toilet hole for cement backer board and tile in 3 bathrooms - significantly cut my time in cutting the holes.

I quickly drilled through quartz counter to install an RO system. I wouldn't expect the same bit to perform as well a second time. It seems somewhat worn. But a second bit came with this order, so I guess I could get the same results at least one more time. I'm happy with the purchase. I got what I needed at a low price.

It did the job in drilling thru stone but not easy, did not like the shaft it is way too shorter than others and being round. Why round and not hex?

Love these! As long as you keep them wet while you’re using, they last a really long time. Very durable. And a nice size for making flower pots. Thank you.

Used to bore hole for shower valve through 1/2 inch tile. Made a jig using 1/4 plywood so it didn’t slip on tile. Use plenty of water and go slow, happy with result. Bought a 1 1/4 inch bit as well for shower nozzle. Both worked well for the price

I liked the price and two came in the package. I drilled holes in some clay pots with no problems they worked good as advertised.

I wore it out pretty quick

bought this to drill a hole in some bottles for a home made bong. 14mm stem & a grommet from HD with the drill bit worked perfect. just make sure to keep the glass and bit wet while drilling and yo won't have any issues