Terrible product! These "tools" (and I use the term VERY vaguely) are a lot more boring than most children's toys, and actually don't even come close "Cut" They polish into wood and plastic You end up with a very rough, uneven bevel with chatter, burn marks and nicks You use them! When you finally buy them, please understand that you only use them buy for demonstration or to practice your sharpening skills, not to do the job they were designed for which is cutting countersinks or chamfer holes.