Review on Diamond Ceramics Porcelain Ceramic Marble by John Bennett

I installed some handrails in my shower for tiles. The tiles are very hard and I had to use diamond drill bits to drill holes. These bits work fine. They don't last long, but I'm not sure any bits will. You will go through several of them, so buying a pack of 10 and just using them is great. I think I could drill about 1.5 holes per bit. Helps to channel water through the bit while drilling and use some sort of drill guide. Would definitely buy them again if I had to drill through a tile.