Knipex Cobra Water Pump Pliers (12″)Knipex Cobra Water Pump Pliers (12?) Adjustment at the touch of a button directly on the workpiece Fine adjustment for optimum adaptation to different size workpieces and a comfortable gripping position Self locking on pipes and nuts: no slipping off the workpiece and low handforce required Gripping surfaces with special hardened teeth, teeth hardness (approx. 61 HRC): low wear and reliable gripping Box joint design: high stability because of double