Steel: 6140CrV 44-48 HRC Nickel plating A: 20 mm B: 30.5 mm Length: 220 mm The hinged combination wrench is a non-detachable design of a drive and an extension with a hinged twelve-point box end (angle of inclination 180°). It combines the capabilities of a box end and an open end profile. It is designed for efficient use and transmission of significant force when working in hard-to-reach places. Rotating the box end parallel to the body of the wrench allows for quick loosening and tightening of fasteners when no significant force is required. The open end profile allows for working with fasteners in cases where access to fasteners is possible only from one side. You can also purchase sets of hinged combination wrenches, 516 061 and 516 091.