💎 High-quality 6 30mm Diamond Coated Ceramic Marble for Superior Cutting and Polishing Review

They are great for what they are designed for. I used them for porcelain tiles. I started it in a drill press to start a groove (there's no center drill bit to hold on to). Then I put everything in the sink and the water dripped onto the drill as I slowly drilled the rest of the way. I'm not giving them 5 stars because of the missing center piece. I understand they are designed for a drill press, but most don't have water cooling.

Worked as described, perfect holes in marble tile and cement board with little effort. The hardest part was guiding it [at an angle at first], but once it bites in and you straighten the bit, it only takes a minute. Provided you have adequate cooling and are letting the drill work at its own pace, don't apply much pressure or speed. I made a small "wall" of plumbing putty around the area I was cutting, filled it with water, and added more water as I drilled to keep it clean and cool.

My wife wanted to make some crafts out of these glass blocks/bricks that are often used in bathrooms. She wanted to turn one of them into a coin bank, so I wanted to cut a hole just over 1 inch in diameter so the coins could easily fit in. We checked the local hardware store and didn't see anything the size I needed. I ordered this set and used 1 1/8" to cut the hole. The glass was quite thick, but I probably finished the cut within a minute. The glass isn't cracked/broken/damaged. ok, so I…