I collect all kinds of specialty drill bits because I've found you need them, not often when you have a home. This is a good little set of special drill bits designed for glass but also suitable for masonry and ceramic materials. Normally you drill with a hammer drill for these kind of bits, I have one too. I may or may not need to use them in a week or two. It depends. Maybe I'll know soon enough. But it's a pretty good set of drill bits in the size I can use.