Pololu's compact brushed DC gearmotors are designed to deliver significant power despite their small size. This particular model features a 6V brushed DC motor with long-lasting carbon brushes, paired with a 25:1 metal spur gearbox. The cylindrical gearmotor has a diameter of 20mm, while the D-shaped output shaft is 4mm in diameter and extends 18mm from the gearbox's face plate. Notably, this model is equipped with an extended motor shaft measuring 6x2mm. This gearmotor's key specifications include a voltage of 6V, no-load performance of 570 RPM and 150 mA, and stall extrapolation of 1.6 kg⋅cm (around 22 oz⋅in), 2.9 A. Pololu's gearmotor is ideal for a variety of applications, from robotics to custom projects. Its compact size allows for easy integration into tight spaces, while the extended motor shaft provides additional flexibility for mounting and coupling. The robust metal gearbox ensures durability and smooth performance, even under high-load conditions. The long-life carbon brushes in the motor contribute to the gearmotor's longevity, reducing the need for frequent replacements and maintenance. Plus, with its impressive power output, this gearmotor can handle demanding tasks with ease, making it a reliable choice for your motor-driven projects. In essence, Pololu's 6V brushed DC gearmotor with a 25:1 metal spur gearbox and extended motor shaft offers a unique blend of power, durability, and flexibility. Whether you're a hobbyist, a professional engineer, or a DIY enthusiast, this gearmotor is sure to meet your needs.