Makermotor Electric Gear Motor 12v Low Speed 50 RPM Gearmotor DC + Roller Chain Sprocket Gear Rated Voltage: 13.5 VDC Rated Speed: 50 RPM Rated Torque at 50 RPM: 6 N-m (4.4 ft-lb) Rated Load: 60 Watts Sprocket Standard: ANSI/ISO #35 to fit roller chain #35 (Pitch 3/8", Roller Diameter 0.200", Roller Width 3/16")