At no load, the output shaft turns at 6 RPM with 12 volts and draws only 85 mA doing it. Slower speeds can be attained by reducing the voltage. The shaft is 0.2" dia, 0.4" long, and is flatted by 0.04". There are three mounting holes on the face of the gearbox for mounting. I think they are tapped to a 4-48 machine screw size. This motor is easily controllable with a decoder.