The knipex 81 series plastic pipe grip pliers are great for siphons tube fittings and connectors up to 80mm diameter they have 25 adjustment positions and a box joint design with an ergonomic handle geometry the fine adjustment is ideal for adjustment to diverse diameters they have a robust heavy duty design and are made from forged chrome vanadium electric steel that has been oil hardened with serrated gripping jaws the handles are fitted with a non slip plastic coating ideal for tightening and