Wera Safre-Torque A 1 SHK Tool Set 1. Torque wrench with slide-over mechanism. Once the set torque has been reached the tool cannot be over tightened so that excessive torque cannot be applied. Setting range of 2 to 12 Nm for controlled clockwise and counterclockwise torque operation. Easy setting and saving of the default value: The audible and tactile clicks on reaching the scale values facilitate the safe setting of the desired torque value. With Torque Lock function for use as a standard ratchet without torque function. Max. breaking torque of the 1/4″ square head as per DIN 3122.