The 313:1 Metal Gearmotor 20DX46L MM 12V CB is a small, high-power, high-efficiency brushed DC motor with an integrated 313:1 gearbox. It is made of metal, making it more rugged and durable than plastic gearboxes. The ratio of the gearbox is 313:1, meaning the output shaft turns 313 times slower than the motor shaft. This gearmotor has a nominal voltage of 12V, and includes extended-length, 4 mm diameter, metal output shafts. It is part of the Pololu range of DC gearmotors and can be used for a wide range of applications, including robotics, RC vehicles, small robots, and manufacturing.