3pc 1/2"Dr impact extension bars. 75mm - 125mm - 250mm Long. For use on all air powered & battery powered impact tools/wrenches & breaker bars Made from heat-treated hardened and tempered Chrome-Vanadium Steel. With an industrial black phosphate finish. Set Includes - 1x 1/2" inch drive extension bar by 75mm long (approx 3"), 1x 1/2" inch drive extension bar by 125mm long (approx 5"), 1x 1/2" inch drive extension bar by 250mm long (approx 10"). All 3 extension bars have a heavy duty spring loaded ball bearing to holed socket securely in place. And all 3 extension bars have a drilled end to facilitate retaining ball bearing for use on ratchets and breaker bars.