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Expert Quality, manufactured from chrome vanadium steel hardened and tempered, with a polished finish. Each ext. bar has a knurled ring for extra grip. Attached with a spring - loaded ball bearing for secure socket holding. Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications Features and Benefits • Expert Quality • Contents: 45, 75, 150, 250 and 450mm • Allows sockets to be driven at up to 15° off vertical • Chrome vanadium steel hardened, tempered, chrome plated and polished • Spring-loaded ball bearing for secure socket holding Contents 5 x Extension bars: 45, 75, 150, 250, 450mm