These knipex 8751250 extra slim cobra water pump pliers have automatic adjustment and they can be opened and adjusted directly at the workpiece with one hand the handles incorporate a multi purpose press button for fine fitting directly onto the workpiece the extra long narrow jaws provide good access the integrated spring of the automatic adjustment is shielded in the handles for user safety and the gripping surfaces have special hardened teeth which are hardened to approx 61 hrc these knipex 8