Draper Push Through Torque Wrench, 1/2" Square Drive, 50 - 225Nm - PTWExpert Quality, double sided, push through 1 2" square drive head allows the user to operate the wrench on both clockwise and anti clockwise threads. For clockwise and anticlockwise threads 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 and Supplied with a calibration certificate. Manufactured and calibrated to the DIN ISO 6789 Key