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  1. The exterior hex is 16mm and it’s for some of the caps and fasteners on Race Face cranks.

  2. Financial_Initial_92 on

    Probably to remove the “self extracting nut” part of the self extracting bolt (on crank arms) . Adapter because a lot of people have 8 mm Allen/hex keys but not the much larger size needed for much larger Allen/hex sizes .

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