Shimano Dura-Ace BR-R9170 disc brake caliper SM-BH90 Flare Nut Unit. This nut unit can be used with the ST-R9270, ST-R9170, ST-R9120, ST-R8170, ST-R8070 & ST-R8020 shifters.

The following are an “A” match which indicates that the parts are the same in materials, appearance, finish & size etc.

– Shimano Dura-Ace BR-R9270
– Shimano Ultegra BR-R8170
– Shimano Ultegra BR-R8070
– Shimano 105 BR-R7170
– Shimano 105 BR-R7070
– Shimano Tiagra BR-4770
– Shimano GRX BR-RX810
– Shimano GRX BR-RX400