Dry Diamond Drill Bits Set 10 PCs 1/4" 6mm Small Diamond Hole Saw Kit for Granite Marble Porcelain Tile Ceramic Stone Glass Hard Materials (not for Wood) Round Shank

It did fit in my Dremel but I did buy another Dremel but I haven't tried to use it in that one. Hopefully it will fit 🤞

Good bits for drilling porcelain tile. If you use them properly, drill for 10 seconds, cool the bot by dipping in a container of water for 5 seconds then back and forth they work well. I drilled 20 holes through porcelain tile into concrete before the first bit wore out. Probably would have done more but I accidentally started 2 holes on hammer mode of hammer drill. Don't do that, it will destroy the bit. I accidentally did that on another bit before realizing I was on hammer mode and only got 4 holes drilled. Totally my fault.

I got these to drill holes in porcelain tile to be able to hang the shower doors. It takes a while to cut through. I used a wet sponge to cool off the bits. For 16 holes I used 4 bits. The trick with these is to use a carbide bit that has a point on it first to get the hole started and then use these, so it does not slip on the surface.

GRANITE...Dry diamond drill bits. I was amazed at how easily they cut through granite. Installed two grab bars in my 1.5” thick granite shower walls. I used 5 bits for 10 holes. I used my cordless drill to start hole at 45 degree angle then switched to my cheap corded hammer drill (purchased from Harbor Freight) to drill through. DO NOT use the “hammer” setting on the drill, I only used this drill in normal setting for its high speed. The key is to frequently pull the drill bit out from the hole (plunge) to clear the grit that clogs the hole. I would pull the bit out after 4-5 seconds of moderate pressure dragging grit with it and after a couple of times I then put the bit in a bowl of cold water to cool it down and clean the bit. Take your time, the bit will do the work. A quarter inch bit will leave a slightly larger hole so before I put screws in. I put a plastic wall anchor in with some construction glue on it. Then used 3” screws to get through the granite and dry wall into the wall stud. I located the studs using my finder ABOVE the shower wall where there is finished dry wall, then plumbed down the side to make my holes.

Works like a charm. Honestly i did not think it was going to last long, but i did 20 holes in porcelain with the same bit.(and it is still good for many more holes)