Flip reverse Chrome Vanadium steel ratchet heads with a smooth action mechanism. Scale graduated in Nm and lb.ft. Calibration tolerance in accordance with BS EN ISO 6789-1:2017. All individually tested to standards with ±4% accuracy and issued with an individually numbered test certificate. Aluminium knurled handles for comfort and control. Torque screwdriver with 1/4"Hex quick release bit holder. Tested to standard with ±6% accuracy, includes test certificate. Supplied in an EVA foam storage tray.