Draper - 1/2" Sq. Dr. Satin Chrome Wobble Extension Bar (250mm) Expert Quality, with wobble end, manufactured from chrome vanadium steel hardened and tempered with a micro satin finish. Each ext. bar has a knurled ring for extra grip. Machined wobble end allows sockets to be driven at up to 15° to the vertical. Attached with a spring - loaded ball bearing for secure socket holding. Display packed.