This expert quality torque wrench can be operated on both clockwise and anti-clockwise threads The Draper 83317 1/2\" torque wrench has a double-sided push through design which allows it to be operated on both clockwise and anti-clockwise threads. It comes supplied with a calibration certificate so is ready for use. Features: An expert quality, double-sided, push-through 1/2\" square drive torque wrench The head allows the user to operate the wrench on both clockwise and anti-clockwise threads The easy adjustment knob allows simple setting of the micrometer type mechanism Each torque wrench is individually tested and calibrated to the DIN - ISO 6789 standard Supplied with a calibration certificate Specification: Manufactured and calibrated to the DIN-ISO 6789 Drive: 1/2\" Square