Knipex Tools 87 21 250 SBA Cobra Quickset Water Pump Pliers adjustment at the touch of a button directly on the work piece Fine adjustment for optimum adaptation to different size work pieces and a comfortable gripping position Self-locking on pipes and nuts: no slipping on the work piece and low hand force required Gripping surfaces with special hardened teeth (61 HRC) Box-joint design: high stability because of the double guide, pinch guard prevents operators' fingers from being pinched