Rotor
ROTOR Shimano Crank Chainring Bolts - Dura Ace 9100
$99.95Chainring cover bolts, DURA ACE DESIGN - to fit Shimano 9100 110 BCD 4 bolt mounting Qrings and QXL oval chainrings.
Specially designed flush fit cover bolts for Shimano 4 bolt Dura Ace cranks (9100)
These will fit Ultegra and 105 4 bolt cranks but may not be totally flush, they are specifically designed for Dura Ace.