Knipex Cobra® High-Tech Water Pump Pliers 12" 87 02 300Adjustment 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 guide. Reliable catching of the