The Knipex 87 01 Cobra Series Water Pump Pliers are made from chrome vanadium electric steel, which has been forged and multi-stage oil-hardened for excellent durability. The gripping surfaces have special hardened teeth, with hardness approx. 61 HRC to ensure high wear resistance and stable gripping. A press-button action allows fast and firm adjustment directly on the workpiece. The pliers allow fine adjustment, for optimum adaptation to different sizes of workpiece and are self-locking on pipes and nuts to prevent slipping. Their box joint design provides high stability. A reliable catching of the hinge joint ensures no unintentional shifting. The Knipex Set of 3 Cobra Water Pump Pliers contains: 1 x 87 01 180 Cobra Water Pump Pliers PVC Grip 180mm. Length: 180mm (7in).Capacity: Pipes: 42mm, Nuts: 36mm.Adjustment Positions: 18. 1 x 87 01 250 Cobra Water Pump Pliers PVC Grip 250mm. Length: 250mm (10in).Capacity: Pipes: 50mm, Nuts: 46mm.Adjustment Positions: 25. 1 x 87 01 300 Cobra Water Pump Pliers PVC Grip 300mm. Length: 300mm (12in).Capacity: Pipes: 56mm, Nuts: 46mm.Adjustment Positions: 30.