DC motors models RS-540 or RS-545, Carbon brush dc motor, Cylinder, Diameter35.5 mm, length 50 mm; shaft 3.175 mm, fixing screw 2-M3.0 mm. Operating voltage: 3.6~60V, At no load Speed 2,000~25,000 r.p.m, Output about 3~75W. fit for power tools, massager, hair dryer, paper Shredder, vacuum cleaner, haircut apparatus, printer, air pump, vending machine, blender, , drill & screw driver, forest tools, etc.