"Despite what it says this will drill about 10 holes well in a grade 5 tile. I found that the best way to start it off was using a glass tile bit on hammer function to give this bit something to bite into, otherwise on polished tiles it just flew around. This is good for a small DIY project if you only need a dozen holes drilled. If your serious about getting good results do what I'm doing, save for the best you can afford!!!"
"I was hoping it could cope with the 1 cm thick hard tiles I just put up. I took it slow and the first 2mm looked ok then the diamond bits fell off and it would not drill any more so it went back for a refund"