Draper Expert 3/8" Sq. Dr. Wobble Extension Bar Range - Draper Expert 16740, Expert Quality, with wobble end, manufactured from chrome vanadium steel hardened and tempered with a polished 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. Draper Expert 16740 3/8" Sq. Dr. Wobble Extension Bar (300mm)