Adjustment right on the workpiece at the touch of a button. Precise adjustment for perfect fit to different workpiece sizes and ergonomic handles. Self-locking on tubes and nuts: no slipping on the workpiece, less effort required to work. Specially hardened teeth inside the jaws, hardness approx. 61 HRC: safe clamping thanks to high wear resistance. Double-guided hinge: high stability. Hinge pin locks securely: no accidental adjustment. Protective pin to prevent pinching. Forged chrome-vanadium steel, oil-hardened in several stages.