The Pololu 156:1 Metal Gearmotor 20DX44L MM 12V CB is a compact, high-power, rugged brushed DC gearmotor. This type of motor is designed for continuous operation at 20D x 44L mm form factor, with a power rating of 12V, maximum output torque of 32 Nm and a no-load speed of 68.3 rpm, allowing for a very large range of applications. It features an integrated controller board that supports both locked-antiphase and sign-magnitude operations, as well as two separate channels (channel A and channel B) of five digital lines for reset, DIRI, speed, receive clock and receive data signals, or for a two-phase step command. The metal gears offer your superior performance and durability, and the metal gearbox is temperature and noise resistant. This heavy-duty motor is ideal for robotics, material handling systems, and other high torque applications.