I bought one of these to clean the brass bows and add some (about 2) threads. However, after two or three bends, I noticed that the outer (opposite the home) teeth of the die were broken off. I figured maybe I had a bad stamp or did something wrong, so I ordered a second one. When I used it today, the same teeth broke on the first elbow I tried. I will definitely not buy any more of these. I'm glad some of the other reviewers were lucky, but I definitely didn't find them to be someone I would ever recommend.