The Knipex Cobra water pump pliers are designed for secure gripping and adjustment on pipes and nuts in plumbing and mechanical tasks. Forged from chrome vanadium electric steel and multi-stage oil-hardened, these pliers offer durability for demanding manual work. The head features specifically hardened teeth with a hardness of approximately 61 HRC to provide resistance against wear and maintain a stable grip during operation. A push-button mechanism enables rapid adjustment directly on the workpiece, allowing for fine-tuned settings to suit various diameters. The box joint construction enhances structural stability, while the self-locking design prevents the pliers from slipping off fasteners or conduits. A guard is integrated to prevent operator finger pinching, and the hinge bolt locks securely to avoid unintentional movement during use.