Sealey micrometer torque wrench 3 4 sq drive calibrated sealey premier ak628 heat treated steel ratchet head fully hardened and tempered chrome plated for corrosion resistance calibration tolerance in accordance with bs en iso 6789 2003 every wrench is tested and supplied with an individually numbered test certificate micrometer type torque range adjustment with scale graduated in both lb ft and nm flip reverse ratchet mechanism supplied in storage case sealey ak628 micrometer torque w