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. Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications