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Expert Quality, manufactured from chrome vanadium steel hardened and tempered with a polished finish. Each extention bar has a knurled ring for extra grip. 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: 50, 125, 250 and 500mm • 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 4 x Extension bars: 50, 100, 150, 250mm