Rivet Nut Tool Mandrel M10 and 10 Rivet Nuts, Rivet Tool Set Spare Part, Nutsert Tool Accessories Set Compatible with Amjoy/RZX/Astro Riveters. Premium Quality: M10 mandrels are made of high-hardness carbon steel to maximize wear and tear; you don’t need to worry about breakage and the short service life of the accessories.