Combines the convenience of the push-button adjustment on the workpiece and the function of an all-purpose tightening tool. For use with inch and metric nuts and screws with widths across flats from 3/8" to 1 1/4" - self-locking in the range from 11/16": no slipping off the workpiece. Reliable and tight gripping of rounded, rusty or overly painted nuts and screws. Ideal for work on vehicle brake systems. Quick tightening of nuts and bolts using ratchet action. Adjustment at the touch of a button directly on the workpiece, one-hand operation. 15 fine adjustments of optimum adaptation to different size workpieces and a comfortable gripping position. Box-joint design: high stability because of double guide. Reliable catching of the hinge bolt: no unintentional shifting. Favorable lever action: optimum transmission of force. Pinch guard prevents operators' fingers being pinched. Replaces a set of wrenches, ideal for tightening locknuts. Chrome vanadium electric steel; forged, multi stage oil-hardened.