Durable, reliable and accurate mechanism.Range covering from 4 to 20 N·m/40 - 180 in.lb torque values .Can only be used clockwise .Accurate to ±3% of reading which exceeds the requirements of ISO6789-1:2017 .Clicking system triggers a tactile and audible signal .Reversible round ratchet head in 1/4" square drive allowing CW operation only .In a semi-transparent square tube with eurohole hanger .On request preset wrenches can be set and certified with a declaration of conformity.Made in the UK