Review on DiamondSure Granite Ceramic Porcelain Cutting Tools with Diamond Technology by David Ross

I bought this because the other part I had just didn't work. When I got this thing it worked really well and drilled the first hole in about 3-5 minutes. When I went to do the other 2 holes it took longer. At the third hole I didn't seem to be halfway through the mark and then I noticed that half of the head had broken off at the hole. The only reason I didn't get 1 star was the price which worked but not long enough to get the 1 job I needed. (Installation of the toilet flange on the tile.)