This is a Shimano Dura-Ace BR-7800 caliper brake pivot nut, also known as deeper sunken nuts for carbon forks - 18mm depth. This is an "A" match for the following brakes: Shimano 105 BR-5500 Shimano 105 BR-5501 Shimano 105 BR-5600 Shimano 105 BR-5700 Shimano 105 BR-5800 Shimano 105 BR-R7000 Shimano BR-R450 Shimano BR-R451 Shimano BR-R560 Shimano BR-R600 Shimano BR-R650 Shimano Claris BR-2400 Shimano Claris BR-R2000 Shimano Dura-Ace BR-7700 Shimano Sora BR-3300 Shimano Sora BR-3300-A Shimano Sora BR-3400 Shimano Sora BR-3500 Shimano Sora BR-R3000 Shimano Tiagra BR-4400 Shimano Tiagra BR-4500 Shimano Tiagra BR-4600 Shimano Tiagra BR-4700 Shimano Ultegra BR-6500 Shimano Ultegra BR-6600 This is also a "B" match for the following brakes: Shimano Ultegra BR-6700 Shimano Ultegra BR-6800 Shimano Ultegra BR-R8000 "A" match: indicates that the parts are the same (material, finish, size & appearance). "B" match: indicates that the parts are usable, but may be different (materials, finish, size & appearance).
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