Don't toss your hand rivet nut gun just because the tips are worn out! This 14-piece replacement set has you covered. It includes both the mandrel (the pulling stem) and the matching nose piece for each of these sizes: M3, M4, M5, M6, M8, M10, and M12. That's 7 sizes, each with its own pair, so you can switch out the tips to set different size rivet nuts (also called threaded inserts). Made from high-speed steel, so they're tough and should last through plenty of use. Perfect for auto repair, metal fabrication, furniture assembly, or any job where you need strong threaded fasteners in sheet metal or thin materials. Easy to install on most standard hand-operated rivet nut tools. Keep your tool working like new and tackle a variety of projects with just one gun. Comes in a simple pack—great to have as spares in your toolbox.