... good motors, the motors are always the three phase motor and single phase motor, so, if you need motors, pls send requirement ... number: RV 030, 040, 050, 063, 075, 090, 110, 130Material for RV gearbox:Worm wheel: inner is nodular cast iron, outside ... (Cr) steel (Carburizing);Housing: aluminum with oven painting for RV030-090, cast iron for RV110-130;Frame Color: silver or blue;Gurantee ...