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

These bits are amazing, cut through granite, tiles and glass, without any issue. I used to use to is 1/4 inch Milwaukee tile bits, which is about $28.99, at Home Depot currently, no thank. 10 of these blue bits will last me a whole year when compared to those Milwaukee's over priced bits.

Works great for using on rocks. Easy to use, cutting speed was faster than I would have thought, super durable, valuable for the money

I am a general contractor and install quite a few shower stalls and range hoods in new condominiums in new homes. I have been purchasing similar items to these at a far greater cost. I've been paying the same price for a single unit if not more money. Well they have worked okay I am quite surprised and very pleased to find that these particular ones work just as good if not better than a lot of the others I have used. I am extremely pleased with this product and will definitely purchase it again. I have found having a squirt bottle with you while you're drilling and keeping the whole wet really helps prolong the lifespan drastically. They work quite well dry as advertised that used wet really improves the lifespan. Excellent value very happy with this purchase

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.

I drilled 24 holes in ceramic tile. I used 2 bits and just started with the third bit. They did a great job. I probably could've done it with 2 bits, I just like a fresh bit.