Range: 5-25 Nm (44-221lb.in). Chrome Vanadium steel ratchet head with smooth action mechanism. Calibration tolerance in accordance with BS EN ISO 6789:2003. Scales graduated in both Nm & lb.in/lb.ft. Wrenches are individually tested to standards with ±4% accuracy & each wrench is issued with an individually numbered test certificate. Supplied in storage case. Model No. STW101