400 i VDE Hex Insulated torque-indicator400 i VDE Hex Insulated torque indicator Wera Hex Plus VDE torque indicator with fixed pre set torque for hexagon socket screws. Tamper proof design; prevents any accidental or unwanted change of torque value. Robust slip clutch generates a clearly audible and tactile trigger that signal's when the set torque is reached, thereby making it impossible to apply any further torque. The loosening torque is significantly higher than the tightening torque,