Automatic adjustment, single-hand operation for both right and left-handed users. Optimal for frequent changes between different workpiece sizes. Self-clamping on pipes and nuts, slim design across the entire head and joint area, precisely enclosed hinge bolts. Through-pinned joint, pinch guard, and locking mechanism. Gripping surfaces with specially hardened teeth, tooth hardness approx. 61 HRC. Chrome vanadium electric steel, forged, multi-stage oil-hardened, pliers grey atramentized, head polished, handles coated with anti-slip plastic, DIN ISO 8976. Adjustment to the workpiece is automatic with the KNIPEX SmartGrip®! Place pliers on the workpiece, squeeze handles together. Done! Pipe diameter 1 1/4 " Features polished, forged, oil-hardened Cutting edge hardness 61 HRC Main color black Length 250.0 mm Secondary color red Application assembly / disassembly Type/kind Article Version water pump / pipe wrench