One of the most time saving tools I have ever had. I needed a way to solder punch holes in thin strips of zinc for modern battery designs. The spot welding didn't work because the straps are thicker than usual. And the soldering needs to be hot and fast, through holes allow for that. I used to try drilling strips in an array. Always messed up. But this tool saved the day, going through the strips like clockwork. Permission is enough for any work. built ten times stronger than necessary. So I assume this tool will last forever. When I wear out the stamp. Looks like I can only find a replacement.