NIUNIU [Feature] 20000 RPM gearbox with 6V motor, RS550 drive motor is made of heavy duty plastic plate combined with high quality motor [High speed] Specially customized for children Car modification, car modification with high speed. You can also adjust the speed, but the speed of the electric gear motor can only be reduced, it cannot be raised. Low noise and high torque [Field of use] Gearbox is used in most children's drive wheels, it is suitable for remote control cars, cars and motorcycles, ATVs, karts, children's vehicles and other modifications. It is a good choice to replace the broken one Quantity: 1pc Colour: Black Size: power 20-45W, motor length 5.7cm width 3.7cm bottom diameter 3.5CM The gearbox housing is 18cm long. Plum semicircle inner diameter 5.0cm outer diameter 5.3cm Plum Blossom Block Inner Diameter 6.0cm Outer Diameter 6.3cm Axle Hole 12mm Plum Blossom Outer Box 9.2cm