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 loosening siphon screw connections, plastic pipe fittings and round union nuts. Also for connectors and couplings with a screw connection, such as Cannon circular connectors and for gentle loosening of hoses on nozzles. 81 01 250 SB: Black Atramentised Finish. 81 03 250 SB: Chrome Finish. Specification Length: 250mm. Adjustment Positions: 25. Capacity: 25-80mm. Weight 355g.