British Whitworth Tools and British Standard Size Reference Table
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Hex Points Socket and Twelve Points Socket
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Progress is fine, but it's gone on for too long.: The evolution of standard wrench sizes
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Metric Full Hex Nut Zinc Plated. Full Range of Sizes. – Bescol DIY
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REF: Hex, Socket (Allen) and Torx Bolt and Screw Wrench Sizes - Sportsterpedia
Progress is fine, but it's gone on for too long.: The evolution of standard wrench sizes
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Spanners and Wrenches - DT Online
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How do I determine the Wrench size or Hex Key size for Hex Head Bolts and Socket Heads?
