DC motors models RS-770 or RS-775, Carbon brush dc motor, Cylinder, Diameter42 mm, length 67 mm; shaft 5 mm, fixing screw 2-M4.0 mm. Operating voltage: 6~36V, At no load Speed 2,000~25,000r.p.m, Output about 5~250W. fit for power tools, drill & screw driver, office automaion equipment, air pump & oil pump, forest tools, etc.