Shimano RD-R9150 Dura-Ace Di2 Rear Derailleur Outer Plate & Fixing Bolt Description: The Shimano RD-R9150 Dura-Ace Di2 Rear Derailleur Outer Plate & Fixing Bolt is a factory replacement part. If a rear derailleur cage has become damaged but the rest of the derailleur can still be used, this part will help to restore the proper shifting performance of the rear derailleur. Features: Includes the outer derailleur cage plate and the fixing bolt that holds it into the main body of the rear derailleur Only compatible with Shimano RD-R9150 Dura-Ace Di2 Rear Derailleur Derailleur body, pulleys, inner cage, and other hardware sold separately