I was a bit skeptical when I first bought this product. I had to cut out the middle of two 12x12 tiles for a double shower handle. I tried using a tile cutter to cut out a diamond shape from the center but ended up breaking a few tiles. I saw this hole saw but I was afraid it wouldn't hold well in the center. I was wrong. It worked great! I brought the tiles out into the yard and turned on the garden hose to get the water flowing onto the tiles. I would recommend this as it keeps the diamond grit clean and cool so you don't burn the saw and get a cleaner cut. I was able to achieve cuts in under 2 minutes each. The result looked very professional and my valve holders fit perfectly.