> All-steel construction, superb durability. > The 45-tooth reversible ratchet head results work in both right and left-hand (clockwise and counter--clockwise) direction. > +/-4% accuracy in clockwise direction exceeds international specifications. > Unique, stay-in-place, lock ring makes adjustments easier and secures selected torque form accidental change. > Dual Metric and English (Nm and Ft-lbs) scales are easy to read and set. > The identity code marked on each wrench makes it possible to trace. > Non slip micrometer adjustment style handle with groove design. > Includes a certificate of calibration.