The Knipex 81 Series Plastic Pipe Grip Pliers feature exchangeable plastic jaws designed for sensitive surfaces, making them ideal for siphons, tube fittings, and connectors. They offer fine adjustment for easy adaptation to various diameters, with 25 adjustment positions and a box-joint design for ergonomic handling. These pliers are built for robust, heavy-duty use, constructed from oil-hardened, forged chrome vanadium electric steel with non-slip plastic-coated handles. They are perfect for tightening and loosening siphon screw connections, plastic pipe fittings, round union nuts, connectors, and couplings with screw connections, as well as gently loosening hoses on nozzles. This specific model, 81 11 250 SB, has a black atramentized finish and measures 250mm in length with a capacity of 10-75mm, weighing 355g.