Pipe wrench pliers & screw wrench all in one. Pushed-through joint with optimum level action, can be adjusted 7-fold. Prevented with clamp protection of squeeze faults. Grip areas with special hardened teeth with approx. 62 HRC. Self-clamping on pipes & nuts. No slippage on the work piece. made from chromium-vanadium electro-steel, oil-hardened, with anti-skid grip covers.