I often use Dremel grinding tools in my work. I was very excited when her set was so cheap. But you get what you paid for. It was incredibly frustrating to use. The big problems were that after a few minutes of use they fell apart, scattered everywhere and some of them unscrewed from the main tool. I tried with the basic tools included in the kit (which were worse) and with my current basic tools. terrible. I would strongly advise against ever buying them. If I could give less than 1 star I would. For a small project, the official Dremel home store item, 1 sandpaper is enough for me for 3-5 projects, using these sandpapers for one project took me 8-10 and a lot of frustration.