KNIPEX Cobra®. High-Tech Water Pump Pliers. Push the button for adjustment on the workpiece;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;Reliable catching of the hinge bolt: no unintentional shifting;Pinch guard prevents operators' fingers being pinched