10-Piece Concrete Drill Bit Set（Black）

Very sharp for the first couple of holes I drilled. The tile and concrete I was drilling was the hardest I've ever drilled. Before buying these I had already destroyed 2 other bits drilling 4 holes. This bit made it through 4 more holes. I would buy them again.

What can I say? They go through porcelain tile like a knife through butter. The cross patters makes a difference. I never hung towel bars with so little effort. Highly recommend.

These did what I expected from tile-capable drill bits. Slow going but they get you there. However, my first set wore out after only a few holes. I complained and the manufacturer sent me a replacement set.In the meantime I bought a different brand and there were not very capable of drilling ceramic tile at all. It made me realize how good these bits are, albeit maybe not very durable. But the other brand instructed me to use cooling water. Hmmm.Because I was drilling into wall tile in a bathroom I wasn't able to keep water flowing. But I did start (with the replacement set) to dip the bit into a cup of water after each minute or so. I had to sneak up on the hole diameter - they are very slow going - but with a bit of patience, bob's your uncle. And the bits appear to be as good as new. Time will tell.So I'm revising my rating to 4 stars. I would prefer these bits not need cooling and last longer drilling dry. But maybe that is unreasonable at this price point. The comparison in drilling between these and a similar product is night and day. So I'll live with the negatives and will not hesitate to buy more when these get dull.

Drilled tile very well and quickly. Just keep the bit wet by dipping it in water often and don't force it. Happy with this purchase.

Drill holes in shower tile, worked fantastic