Fast adjustment directly on the workpiece; fast and comfortable handling. Fine adjustment; ensures optimum adjustment to differently sized workpieces and user-friendly handle position. Secure catching of the hinge bolt; no unintentional shifting. Box-joint design; high stability because of double guide. Self-locking on pipes and nuts; no slipping on the workpiece and low hand force required. Gripping surfaces with special hardened teeth, teeth hardness approx. 61HRC; low wear and secure gripping one-hand adjustment. Guard prevents operators' fingers being pinched. Favourable lever action; optimum transmission of force. Chrome vanadium electrical steel, oil-hardened and tempered. Plastic coated handles.