The Wadfow 10.5” Inch Aluminum Rivet Nut Gun with 4pcs Mandrels Kit (WHR5710) is a versatile tool designed for inserting threaded rivet-style fasteners into thin materials such as metal, plastic, or fiberglass. This kit includes an aluminum rivet gun, a mini wrench, and four interchangeable metric mandrels (M3, M4, M5, M6), along with a total of 40 rivet nuts—10 each of sizes M3, M4, M5, and M6.