Quick-Adjust Rivet allows one-handed fast, easy adjustment of plier jaws. Wide range of versatile jaw positions. 2-3/8-Inch (60 mm) maximum parallel jaw opening for a range of applications. Smoothly adjusts between six machined tongue and groove jaw positions. Secure tongue and groove design for non-slip grip, even with heavy pressure. Robust teeth for sure gripping action. Induction hardened jaws for long life.