Pololu's small brushed DC gearmotors are compact powerhouses, ideal for a variety of applications. This particular model features a 6V brushed DC motor with long-life carbon brushes and a 78.13:1 metal spur gearbox. Despite its small size, with a diameter of just 20mm, this gearmotor packs a punch. The output shaft has a D-shaped profile, is 4mm in diameter, and extends 18mm from the face plate of the gearbox.Key specifications for this gearmotor include a voltage of 6V, no-load performance of 180 RPM, and 150 mA, with a stall extrapolation of 4.4 kg⋅cm (61 oz⋅in), and 2.9 A. These specs highlight the gearmotor's ability to deliver high performance in a compact package.This gearmotor from Pololu is perfect for use in small robots, RC models, and other hobbyist applications. Its durable construction ensures long-lasting performance, while its compact size makes it easy to integrate into a variety of designs. The gearmotor's high torque output and efficient power consumption make it an excellent choice for demanding applications.In conclusion, Pololu's 6V brushed DC gearmotor with a 78.13:1 metal spur gearbox offers a unique combination of compact size, power, and durability. Whether you're a hobbyist, designer, or engineer, this gearmotor is sure to meet your needs for a small, powerful, and reliable motor solution.