DURABLE: This 3 piece torque wrench set is made from strong chrome vanadium steel for durability. CONTENTS: It has a 12mm (1/2″) square drive with a setting lock and reverse lever, the set also includes a 1/2” to 3/8” adaptor and 10cm 1/2” drive extension bar. CARRY CASE: With a torque range of42-210 Nm, 4.3-21.4 m/kg, the set is supplied in a sturdy, blow moulded plastic storage case.