The KNIPEX Pipe and Connector Pliers Series with Plastic Inserts, No. 81 11 250, feature dual component inserts designed for gently loosening hoses and nozzles. The materials include a soft blue outer layer and a firm red inner layer. The Pipe and Connector Pliers series offer 25 easy adjustments with a push of a button. They have a sturdy box-joint design and include a soft jaw to prevent corrosion by not allowing metal from being transferred onto the workpiece. Their rounded jaws also grab round pipes and connectors up to 3-5/32" in diameter, suitable for tightening and loosening screw connections, plastic pipe fittings, and round nuts.