Adjustment at the push of a button directly on the workpiece: quick and easy handling, fine adjustment: enables optimum adaptation to a wide variety of workpiece sizes and a hand-friendly grip position, secure locking of the joint bolt: no unintentional adjustment, box joint: high stability thanks to double guidance, self-clamping on tubes and nuts: no slipping on the workpiece, energy-saving work, gripping surfaces with specially hardened teeth, hardness of the teeth approx. 61 HRC: permanently secure gripping due to high wear resistance, one-hand adjustment, anti-trap protection prevents crushing injuries, favorable leverage: optimum power transmission, chrome vanadium electric steel, forged, multi-stage oil-hardened