Knipex Tools 9K 00 80 122 US Cobra Pliers Tool Set with Keeper Pouch (3 Piece) Adjustment at the touch of a button directly on the workpiece. Self-locking on pipes and nuts: no slipping on the workpiece and low hand force required. Gripping surfaces with special Hardened teeth. Pinch guard prevents operators' fingers from being pinched. Chrome vanadium heavy-duty steel, forged and oil-hardened.