Precision machined from brass stock, flywheels are drilled and reamed for slip fit on drive shaft. Each pack includes two flywheels, with Athearn couplings installed and complete instructions. Dimensions shown are outside diameter, length and shaft size.
 
Micro or Holland can motor fits Athearn F7, PA, F & FP45, Cary F & E, Train Miniature FA, Bachmann F9, Model Power/AHM E and most units with wide hoods.