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Six-Point 3/8" Square Drive Regular Length – Whitworth

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British Standard Whitworth (BSW) is one of a number of

British Standard Whitworth (BSW) is one of a number of imperial-unit-based screw thread standards which use the same hexagonal bolt head and nut sizes, the others being British Standard Fine thread (BSF) and British Standard Cycle. These three are collectively called Whitworth threads.

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