The Groz Self-Locking Pliers deliver a powerful grip on nut and bolt heads for high torque uses. These pliers are manufactured from Chrome Molybdenum steel and have the jaws induction-hardened to 45-60 HRC with a curved design. The unique Groz feature is the spring-loaded release mechanism that offers a controlled release for confined spaces. These pliers also have a wide adjustment screw, coupled with a rolled thread spindle that ensures smooth pressure adjustments while paired with a non-pinch, rubberized non-slip grip guarantees fatigue-free use.