KNIPEX Cobra® XXL. Pipe Wrench and Water Pump Pliers. Greater gripping capacity but much lower weight than comparable pipe wrenches;Fast push-button adjustment directly on the workpiece, no unintentional slipping of the joint;Fine adjustment for optimum adaptation to different sizes of workpieces and a comfortable handle width;Self-clamping on pipes and nuts: no slipping on the workpiece, effortless working;Gripping surfaces with special hardened teeth, teeth hardness approx. 61 HRC: high wear resistance and stable gripping;Box-joint design for high stability due to double guide;Pinch guard prevents operators' fingers being pinched