This gearmotor is a miniature high-power brushed DC motor with a 100.37:1 metal gearbox. It has a cross section of 10 x 12 mm, and the D-shaped gearbox output shaft is 9 mm long and 3 mm in diameter.Key specs at 6 V: 320 RPM and 120 mA with no load, 30 oz-in (2.2 kg-cm) and 1.6 A at stall.