Manufactured from hardened and tempered Chrome Vanadium steel with a fully polished mirror finish. Three universal joints with a spring-ball socket retainer. Unique design allows for smooth rotation and high torque. Features: • One of a comprehensive range of Premier Hand Tools, suitable for daily professional use • Manufactured from hardened and tempered Chrome Vanadium steel with a fully polished mirror finish • Three universal joints with a spring-ball socket retainer • Unique design allows for smooth rotation and high torque • Contents: 1/4", 3/8", 1/2"Sq Drive • Lifetime guarantee* Specifications: Guarantee:Life Model Number: AK27371