Knipex Cobra. Push the button for adjustment on the workpiece. Fine adjustment for optimum adaptation to different sizes of workpieces and a comfortable handle width. Self-locking on pipes and nuts: no slipping on the workpiece and low hand force required. Gripping surfaces with special hardened teeth, teeth hardness approximately 61 HRC: high wear resistance and stable gripping. Reliable catching of the hinge bolt: no unintentional shifting. Pinch guard prevents operators' fingers from being pinched. Capacity half-moon. Capacity in square millimeters. Square drive. Capacity square. Capacity step-like square. Capacity triangular. Clamping width hexagon. Clamping width round. Clamping width square. Clamping width.