This professional hand nut riveter installs threaded inserts securely. The 3-piece set covers M4, M5, and M6 sizes for versatility. The forged steel construction provides strength and durability. The ergonomic handles ensure comfortable operation. The positive return spring allows for rapid operation. The included mandrels are hardened for long service life. The compact design (10" overall length) fits in tight spaces. Ideal for sheet metal, automotive, and electrical applications. The storage case keeps components organized and protected. A reliable tool for creating strong threaded connections in thin materials.