Specifications:
• 45 RPM @ 24 Vdc, 60mA - 23 RPM @ 12 Vdc
• Drive motor - Mabuchi RS-380SH, 1.1" D x 1.67" L
• Gearbox - Molon #CHM-2435, 2.75" x 3.00" x 0.57"
• 5/16" diameter shaft, flatted and splined
• Threaded mounting holes in four corners.
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nice gearmotor 
A good value for a gearmotor. Gearbox is slightly noisy on both units I got. Minimum speed is about 2 RPM at 2.3 V, 40 mA unloaded. Rubber O-Ring on turntable edge makes the package a nice robot wheel + motor. ID of 4 tapped holes on gearbox is 0.163", centers are 2.500" x 2.380" apart.
nice little gearbox
pretty easy to completely disassemble by drilling out the crimped part of the screw mounting holes. I removed the dc motor and replaced with a stepper and will be using it for a model railroad turntable. about 7282 steps for 1 rev with a 7.5 degree stepper.
Neat little motor / gearbox
Draws ~ 50ma at 12V under no load.
Draws ~ 100ma at 12V under moderate load.
If you remove the 'turntable' the motor shaft is roughly 8mm, with a flat on one side and 'anti-slip' grooves around the mid section.
Good buy on a geared DC motor.
One way bearing and sprocket - CAT# CH-10 fits nicely on this motors output shaft after smoothing the ridges. The turntable removes easily. Motor runs smoothly in both directions but a tad noisy. Great geared motor for the price!.
