Specification not available.
Bottom manifold for headset internal cabling for the OC ST-RP22 and ST-RP23 +15º stem.
For electronic and mechanical drivetrains.
HS01 standard: I-SS01 (oval)
Check the assembly indications in your bicycle´s Bluepaper technical manual.
If you do not have the technical knowledge and skills needed for the correct installation of the component, ask an authorised dealer to install it for your safety.