Chrome Vanadium steel ratchet head with smooth action mechanism. Calibration tolerance in accordance with BS EN ISO 6789-1:2017. Scales graduated in both Nm and lb.in/lb.ft. Wrenches are individually tested to standards with ±4% accuracy and each wrench is issued with an individually numbered test certificate. Supplied in storage case. Features & Benefits:Range: 5-25Nm(44-221lb.in).Chrome Vanadium steel ratchet head with smooth action mechanism.Calibration tolerance in accordance with BS EN ISO 6789-1:2017.Scales graduated in both Nm and lb.in/lb.ft.Wrenches are individually tested to standards with ±4% accuracy and each wrench is issued with an individually numbered test certificate.Supplied in storage case.Lifetime guarantee*.Model No. STW101 Specifications: Model No STW101 Brand: Premier Drive: 1/4"Sq Length: 275mm Nett Weight: 0.75kg Range: 5-25Nm(44-221lb.in)