The knipex 87 26 250 cobra vde hi tech waterpump pliers are adjusted by shifting one jaw directly on to the workpiece and can then be opened at the touch of a button off the workpiece they have a fine adjustment for optimum adaptation to different sizes of workpieces and a comfortable handle width the slim size head and joint area allows for good access to the workpiece and they are self locking on pipes and nuts no slipping on the workpiece and low hand force required the gripping surfaces hav