This gearmotor is a miniature (0.94" x 0.39" x 0.47"), low-current brushed DC motor with 75:1 metal gearbox, similar to Sanyo"s popular 12 mm gearmotors. These units have a 0.365"-long, 3 mm-diameter D-shaped output shaft.Key specs at 6 V: 170 RPM and 40 mA free-run, 9 oz-in (0.6 kg-cm) and 0.36 A stall.