Robust design, insensitive to dirt, particularly suitable for outdoor work, good access to the workpiece thanks to the slim design in the head and joint area, anti-trap protection prevents crushing injuries, gripping surfaces with specially hardened teeth, hardness of the teeth approx. 61 HRC: permanently secure gripping thanks to high wear resistance , self-clamping on pipes and nuts: no slipping off the workpiece, energy-saving work, box joint: high stability thanks to double guidance, robust adjustment mechanism, insensitive to dirt, easy to clean, particularly suitable for outdoor use, 11-step notch adjustment with a gripping capacity of up to 3 12", optimized adjustment to the workpiece and a handy grip position, chrome vanadium electric steel, forged, oil-hardened in several stages