I stood in front of my new shower and wanted to "just" plugging the shower rod. After about 10 minutes I had the impression as if micht the tile angrinsen (stoneware!) Just tired and ask me want what I call the with the rock drills wished that I had used - There was nothing to be seen from a hole. After that first time "googled" what the wets on "drilling stoneware" has to offer. After that I then ordered both diamond and the Silver Line Glass and Filesenboher and tried. Conclusion: The drills have a much longer "life" than the diamond drill bit (the first diamond managed just about 1 mm) and were much easier to use, because they are centered by the tip itself. With good cooling (brush with water), slow speed and a lot of patience (more than 30 min / 6-mm well), I then get gradually my 5 holes in the tile.