SPECIFICATIONS: Step Hex Wrench - 3/8"-1/2"-3/4"-1" Working area diameter in mm (min-max): 9.52 - 25.4 mm Material: Chromium-vanadium steel Material Handle: Rubber Handles rattle - 1" Universal use for screws Special design does not cause jamming in nipple and screw fittings Comes with a 1/2" ratchet For mounting and dismounting of heating valve nipple fittings, bottom cut-offs on radiator returns and short valve extensions. **