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.3pc Universal Joint Set• 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 1/2Sq Drive. • Lifetime guarantee*.• Model No. AK27371Model No: AK27371:Brand: Premier:Contents: 1/4PTDSEAAK27371