The Knipex 88 01 series Alligator waterpump pliers feature a box joint design preventing slipping from the workpiece. They are a heavy-duty box joint design made from chrome vanadium electric steel, that has been oil hardened with a self-gripping feature that gives a good solid grip on pipes and nuts. These pliers have hardened teeth to approximately 61HRc, making them very strong durable pliers, with anti-slip casing for added grip and comfort to the user. There is a guard that prevents the operator's fingers from being pinched. The optimum lever action has 7 position adjustment to fit pipe and nuts. Knipex Alligator waterpump pliers come in 180, 250, and 300mm versions with a maximum capacity from 30 to 46mm across the 3 sizes. Self-locking on pipes and nuts: no slipping on the workpiece and low handforce required. Gripping surfaces with special hardened teeth teeth hardness approx. 61 HRC: low wear and secure gripping. Box-joint design: high stability because of double guide Robust