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@dicki
i've got those on my mtb
5 sided alan key style bolts you need the little spanner . alan key thingy on the right to tighten loosen the nuts
kind of anti theft because the alan key nut shape isn't all that common
i didn't have one to start with luckily no punctures my lbs eventually donated a spare from their shop
it just works like a regular nut really nothing particularly special about them