Dura Ace 7900 Caliper Bolts
Comments
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do you mean the pivot bolt?
this might help...
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/BR/EV-BR-7900-2868_v1_m56577569830651588.pdf
the pivot bolt is 7mm at the fat part, and 6mm at the end
my bike - faster than god's and twice as shiny0