The knipex kpx 87 02 250 cobra waterpump pliers have automatic adjustment they can be opened and adjusted directly at the workpiece with one hand the cobra pliers close with a push of a button and offer a good strong grip on the workpiece 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 87 02 250 pliers combine low wear with a secure gripping action w