Includes:

Harmony Adapter, CNC polished (547002)
6 rotor mount screws
6 screws to mount our motorized sprockets

High Quality CNC motorized sprocket for 415 chain, select size below

Important instructions (warning): 
Use thread locking glue on all screws including the 6 holding a rotor, and the 6 holding the motorized sprocket.  Be sure to use Loctite Threadlocker Red 271 High Strength, or equivalent glue.

Application:

Use your existing disc brake hub and rotor to attach a motorized sprocket
Example of a standard 6-bolt disc brake hub (example)