TECHNICAL DATA: Diameter of the working area in mm (min-max): 34 mm Material: Chrome vanadium steel HOOK WRENCH HEAVY 1/2'' Hooks are spare parts for the HEAVY DUTY and ALUDUR one-handed hook wrenches. With the one-handed hook wrenches, you can hold, unscrew and tighten pipes and fittings in the range of Ø 3/4" - 8". FEATURES: Easy replacement of hooks by loosening the locking screw **