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It means that a 12mm allen wrench will be required to tighten it.
I'm surprised that it's 12.9! That's a very strong fastener. Since it is black oxide, it is susceptible to rust, so it's a good idea to paint it before installation.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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