Black 1/4" Dry Diamond Drill Bits Set, 11 PCS 6mm Diamond Core Drill Bit with Storage Bottle for Granite Marble Tile Ceramic Stone Glass Hard Materials (Not for Wood)

When drilling through porcelain, a bit wears out in short order. If you accept that, you can buy inexpensive bits like these or expensive bits from the big box store. Both wear out exactly the same so it makes sense to buy bits like these and discard them once they are worn.

Great value for the money, got these to drill holes in bottles we are making into lamps and they so far have worked out great. Needs very little pressure to get job done, just make sure to use lots of water while drilling, have not tried to drill hole in tile yet but I assume they will get the job done.

I had high hopes but at the end bits don't last enough. Spent 3 bits to make 4 holes over 1/4 bathroom tile. Need to go back to Bosch.

Received this and used it to help fix a chipped glass plate that I have. I liked how well it worked but was not very happy with the wear and chipping that appeared on the coating; be warned - these seem to be somewhat consumable

The media could not be loaded.  I attached a video, but buyer beware! Out of ten bits, I used 9. Eight of the nine either bent or broke. The first bit I used, admittedly, I pushed too hard, but after, I used very gentle pressure using a hammer drill. Contrary the advertising, they do indeed heat up, so while the wax core may help some, don’t expect to be doing hard drilling without liquid.In all, they were low priced, and I managed to bore two holes with nine bits. Not a good drill ratio!

I tried to drill a 1” piece of granite and I had t use two bits to get through it. But it did work.

First and foremost, when using this product or any other tool that drills, cuts or grinds glass or ceramic, wear your safety glasses. As a hobby, I just started making glass wind chimes. I ordered these drill bits to drill small holes in flat pieces of glass and wine bottles. I thread either string or wire to attach the glass. After reading the instructions I was ready to give them a test. If you look closely the diamond chips extend around the cutting edge. I practiced on small pieces of glass and also on rounded glass wine bottles. It didn't take long to adapt to the starting cutting angle. And I've got to admit, these drill bits performed and performed well. They bored through the glass quickly with little pressure. I experienced similar results drilling through a concrete brick. The cut makes what looks like a fine powder, I would recommend using gloves or a shop vac to remove the powder like cutting, because in my case, it was glass shavings. Overall these little diamond drill bits did what they were designed to do. They get my Thumbs Up.

I don't know anything about drills and bits or anything like that but my son needed some drill bits to cut through granite so I decided to order these and see if they would work. Even if they didn't, he could add them to his tools for when he could use them. There are 11- 1/4" (6mm) Dry bits included with a sealed cooling wax inside that melts and cools the cutting face when you are dry drilling. To extend the life of the drill you can add water as a coolant. This Diamond Drill Bit Set is for drilling hard materials but not wood or tempered glass. I didn't order these Diamond Drill Bits until I read that they could be used on tiles, porcelain, granite, ceramics, marble, bricks, etc. That way if I was wrong, I could always come back and say but it says right here that it does. I recommend these Diamond Drill Bits.