Knipex 87 series cobra quickset hightech waterpump pliers are made from high grade vanadium special tool steel that has been forged and then oil hardened for a longer robust working life they combine the proven reliable locking of the hinge bolt with an additional push function which makes it easier to work in very confined and inaccessible areas the adjustment directly on the workpiece is possible by simply sliding the pliers handle they offer reliable locking of the hinge bolt with the first