Shimano Supporting axis unit for normal type RD-R9150

This two-piece axle is a replacement part for the DuraAce Di2 RD-R9150 electronic rear derailleur for the road from Shimano. It is the suspension unit for standard mounting as well as the so-called "B 2 axle" unit for direct mounting. There must be no gap between this bracket and the derailleur hanger. In case of Direct-Mount installation, only the B-axis is used.