Topex nut rivet tool for M3, M4, M5, M6, and M8 nut rivets. This riveting tool can process nut rivets made from hard materials such as steel and stainless steel, as well as aluminum. It is equipped with four interchangeable heads. Nut rivets allow for the connection of metal parts and the later disassembly of the joint. The Topex brand is aimed at DIY enthusiasts.