Hardened tempered chrome-plated and polished. 1/4″, 3/8″ and 1/2″ square drive. Knurled bands. Spring-loaded ball bearing. 1/4″ contains 50, 75 and 150mm extension bars. 3/8” and 1/2″ contain 75, 125 and 250mm extension bars. Hardened tempered chrome-plated and polished. 1/4″, 3/8″ and 1/2″ square drive. Knurled bands. Spring-loaded ball bearing. 1/4″ contains 50, 75 and 150mm extension bars. 3/8” and 1/2″ contain 75, 125 and 250mm extension bars.