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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 retention. Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications Features and Benefits • Expert Quality • Chrome vanadium steel hardened, tempered, chrome plated and polished for corrosion protection Contents 1 x Extension Bar, 1/2" Sq. Dr., 500mm