It's important to know what you're buying before you buy, and this and other grinders have many negative reviews, as do attachments and burrs. A lot of these reviews are unfounded and/or they're not really complaining about the performance of the tool itself. This is a basic electric straight grinder with an idle speed of 25,000 rpm. If you don't know what that means, it's some kind of Dremel, but much bigger, heavier and much more powerful. It has speed and it's fast. Some people claim it…