Any Idea What These Bolts Are

As per title. A mate has asked me to change a few bits and pieces on his bike, among them are these two rusty bolts.
There's nothing like this on my CAADX, so I have no clue what they are.
Preferably in something that won't rust, and available at Wiggle (everything else is in the basket) or possible size to purchase seperately
Bike is a Voodoo Bokkor
Cheers

Yes, a chain is in the basket
There's nothing like this on my CAADX, so I have no clue what they are.
Preferably in something that won't rust, and available at Wiggle (everything else is in the basket) or possible size to purchase seperately
Bike is a Voodoo Bokkor
Cheers

Yes, a chain is in the basket

0
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Check if they are interchangeable.
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Then do the same for all the other bolts on the bike and claim pints of ale of gratitude.
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This is one of the silliest threads I've come across.
Recognition at last Matthew, well done!, a justified honour
Will have the same on the other side.
If you don't want to be resetting the wheel in the right place only remove one bolt at a time.
Parktools :?:SheldonBrown
This, if you look slightly to the left of them you can see the adjuster barrel
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