4mm Hex Torque Indicator, 4 Nm - 400 Hex - 

Wera torque indicator with fixed torque for hexagon sockets. Tamper proof. The robust slip clutch guarantees a clearly audible and tactile trigger signal when the set torque value is reached, and it is therefore impossible to apply any further torque. The loosening torque is significantly higher than the set tightening torque, therefore no additional tools are needed for loosening screw connections. The shape of the handle fills the whole hand well and the fingers lie in the softly rounded recessed grips. This ensures optimal, ergonomic power transmission.