FASTORS Dry Diamond Drill Bit Set,10-Pack Diamond Core Drill Bits for Tile Ceramic Marble Granite Glass Brick Stone,1/4 Hex Shank Size 6,8,10,12 mm

These are the best diamond bits I have ever bought. The cheap hollow tube ones don't hold up long in tile or glass but these are heavy duty. Nice set of sizes. They cut so much better than anything I have tried. And a great price. Recommended to all.

I needed to drill two small holes into my newly installed tile shower wall to install a shower control unit. started with masonry bits and when this did not work I moved to a Bosch glass and tile 1/4" bit. Neither would do more than start a pilot hole. Used one of the 6 mm bits from this kit, working slowly and misting water on the tile as the bit moved through the tile. It took about a minute to walk through the tile but cut smoothly through both holes using just the one bit. I would recommend using the Bosch bits to start the hole since they have a point. Once you have established an indentation into the tile switch over to the diamond bits. Excellent product at a great price!

Drills look very nice. Only used the 1/2" and it works great.

They work. Not a very long life. Using the 6mm bits I could drill 2 holes in porcelain tile. They never got too warm to hold in my fingers. Looked like the diamond chips came off. Worked pretty good until it stopped. Very abruptly stopped.

I used this to drill a hole in our quartz countertop for an extra faucet (we got a reverse osmosis water filtration system, which I also highly recommend.) I tried it at first without a jig and it was clear that was a bad idea so I used my portable drill guide. I was concerned about not being able to clamp the guide down but it wasn’t necessary. Just using that to keep it straight made it so that the hole was perfect. I used two bits to get all the way through the stone. It’s possible I could have done it with one but so much dust built up on the bit after about 2/3 of the thickness that I decided to switch. I also then added water. I’m not sure if that helped with cutting but it was getting EXTREMELY hot and was starting to smoke and it helped with that. The guide was one that’s listed on ace hardware for $43 but I’m certain I got it for less at harbor freight. You’ll definitely need one if you’re going through stone, especially if you want to preserve the finish of the stone, as it’ll jump around a ton. I did not use a hammer driver, as I wasn’t sure how that would go, so I just used my lil’ old battery powered Ryobi drill. I’d say it took about 2 min to get through 1.25” of quartz.

Works well no problems. Cut thru normal tile and marble well with no cracks or chipping

I used then for drilling holes rocks, they work very well!

These are not easy to use. The instructions seem simple but unless your item is clamped down or you have a heavy sturdy grip, they shift when you start. Having a pre-drilled hole would make them better but the point of them is to not have to have that. Once they start, they do work, but they do not save you time.