Freely set torque values within the capacity range. Replaceable socket, ratchet wrenches. ●The ratchet improves efficiency. These wrenches are well suited for repetitive work. ●By replacing the sockets, various sizes of fasteners can be tightened within the tool's capacity range. ●By reversing the ratchet, the wrench can be used to loosen fasteners counter-clockwise. ●Tightening to a torque setting can only be done clockwise. ●Accuracy:±3% of indicated value over the full range.