Product Description No more time-consuming test-adjusting of the correct opening size. Just position the upper jaw to the workpiece, push button and move close the lower jaw, ingeniously simple. 30% more capacity than a conventional pipe wrench. Self-locking on pipes and nuts due to teeth set against the rotation - no slipping on the workpiece. Pinch guard prevents fingers from being pinched. Adjustment at the touch of a button. Has 18 adjustment positions to adjust to hex nuts up to 1 27/64" and round pipe up to 1 1/2". From the Manufacturer Fast adjustment directly on the work piece eliminates time-consuming test adjusting of the correct opening size. Just position the upper jaw to the work piece, push button on pliers and move close the lower jaw. Once adjusted the pliers self-lock on pipes and nuts with no slipping. Optimized shape jaw will grip round, square and hex shaped material. The box joint design provides high stability because of the double guide.