- 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 handforce required- gripping surfaces with special hardened teeth, teeth hardness approx. 61 HRC: high wear resistance and stable gripping- box-joint design for high stability due to double guide- reliable catching of the hinge bolt: no unintentional shifting- guard prevents operators’ fingers being pinched- Chrome vanadium electric steel, forged, oil-hardened