12V 390rpm25:1

The 20mm general gearmotors are widely used on Intelligent robots,intelligent manipulators, intelligent furnitures, Intelligent focusing systems etc. Those are incredibly tough and feature full metal gears. Have  gear ratio 12.5:1 to 488:1, 780rpm~20rpm, stall torque 0.7~6Kg.cmType: MG20B-120390-25Features: Voltage: 6-12 Volts Gear Ratio: 25:1 Stall Torque:1.5kg.cm (12V) No load Speed: 390RPM (12V) No Load Current: 160mA (12V) Rated: 0.6Kg.cm,280rpm,550mA Stall Current: 2.5A (12V)(data sheet at: 12V 780rpm 12.5:1 )