Pololu's compact brushed DC gearmotors pack a punch in a small package. This model boasts a 6V brushed DC motor with durable carbon brushes and a 488.3:1 metal spur gearbox. The cylindrical gearmotor measures just 20mm in diameter, while the D-shaped output shaft is 4mm in diameter and extends 18mm from the gearbox's face plate. This version also features an extended motor shaft measuring 6x2mm. Key specifications:- Voltage: 6V- No-load performance: 30 RPM, 150 mA- Stall extrapolation: 21 kg⋅cm (equivalent to 290 oz⋅in), 2.9 APlease note that the gearbox torque limit is 5 kg-cm. This product comes with a detailed description that outlines important product limitations.Pololu's gearmotors are perfect for a variety of applications. Their compact size makes them ideal for use in tight spaces or for projects requiring a lightweight motor. The extended motor shaft offers additional flexibility for mounting and connecting to other components. The long-life carbon brushes ensure the motor will deliver reliable performance over time, while the high-torque gearbox provides plenty of power for driving wheels, gears, or other mechanical parts.The gearmotor's unique properties make it a standout choice. The combination of a high-voltage DC motor with a high-ratio gearbox provides a great balance of speed and torque. The extended motor shaft is a useful feature not commonly found in other gearmotors of this size, offering additional flexibility in how the gearmotor can be used. With Pololu's gearmotor, you're getting a compact, powerful, and versatile component that's ready to drive your next project to success.