Draper Expert Quality Chrome Vanadium 3/8" Square Drive Extension Bar - 450mm. This extension bar features a knurled ring for extra grip and a spring-loaded ball bearing for secure socket holding. Made from chrome vanadium steel, hardened and tempered with a polished finish. Sold individually. Display packed. Offering a range of genuine tools, from Power Tools to Hand Tools, we are sure to cover your wants and needs.