When you start cutting something hard like ceramic tile, wet the bit. I can't tell you how many packs of masonry pieces I've bought in the past. They all seem to last a while, all but the super cheap ones, but don't expect to find a beat for a lifetime. So the trick is to find a good backpack that will get the job done relatively inexpensively. You are doing a good job. I don't expect them to last very long. I'm sorting out the ceramic tiles in the bathroom. It really helps to wet them. There is a warning on the packaging that you cannot use an impact drill with 4mm and 5mm bits. (There are 6 in a pack). Joeric is known for reliable availability. Some jobs will have you using your expensive beats, others will require something that won't break the bank. They are inexpensive.