Steel: 6140CrV 44-48 HRC Nickel plating A: 20 mm; B: 23 mm; C1: 8 mm; C2: 9 mm; Length: 160 mm A box-end wrench is necessary when servicing hydraulic and pneumatic systems. It is a 6-sided adjustable wrench with a gap for fitting the wrench onto a pipe. The profile of the box-end wrench is more solid and taller compared to the open-end wrench, which increases the contact area and reduces the risk of fastener deformation. The working profile of the box-end wrench is offset by 15º from the longitudinal axis, providing greater versatility when working in confined spaces. The wrenches are made of chrome-vanadium steel. Nickel plating with a protective lacquer layer ensures additional corrosion resistance.