The Knipex 8701150 Cobra high-tech water pump pliers are a genuine Knipex tool designed for professional use. These 150mm (6 inch) pliers feature a unique self-locking action on pipes and nuts, preventing slipping and reducing hand force. With 11 adjustment positions, they offer precise adaptation to various workpiece sizes up to 30mm (1 1/8 inches) for pipes and 30mm (SW 1 3/16 inches) for nuts. The box-joint design provides high stability, and the gripping surfaces are specially hardened to approximately 61 HRC for long-lasting wear resistance. Made from chrome vanadium electric steel, forged and oil-hardened, these pliers are built for durability and reliable performance.