• 8mm no? It's a hex/Allen embiggener (rather than a socket) to fit on the end of a 6mm hex key to enable you to tighten up crank bolts on the road.

  • It's a hex/Allen embiggener (rather than a socket)

    Yup, can only find tranditional sockets and not hex > hex. I'll take embiggener as the technical term :D

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