The Knipex 81 Series Plastic Pipe Grip Pliers have exchangeable plastic jaws for sensitive surfaces and are great for siphons, tube fittings and connectors. The fine adjustment is ideal for adjustment to diverse diameters. They have 25 adjustment positions and a box-joint design with an ergonomic handle geometry. They have a robust, heavy-duty design and are made from forged chrome vanadium electric steel that has been oil-hardened. 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 11 250 SB: Black Atramentized Finish. 81 13 250 SB: Chrome Finish. Specification Length: 250mm. Adjustment Positions: 25.Capacity: 10-75mm. Weight 355g.