3 pinions(32P 15T/17T/19T pinions) Inner diameter: 5.0mm/0.196inch, come with a 3.175mm coupler to convert 3 pinions apertures to 3.175mm/0.125inch. so compatible with 5mm or 3.175mm shaft diameter motor.3660 3670 3674 4274 4268 550 540 3650 etc series motors.
All metal internal gears for strength.Made of heavy duty hardened steel, long time life span.
The speed depends on your gear ration. We provide three different teeth pinion gear to make you more choice in gear ration.
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