... phase motor, as following: The details of RV Gearbox are as follows:RV series worm gearbox:1) High quality aluminum alloy ... Outer packing: Plywood case9) Model number: RV 030, 040, 050, 063, 075, 090, 110, 130Material for RV gearbox:Worm wheel: inner is nodular ... (Cr) steel (Carburizing);Housing: aluminum with oven painting for RV030-090, cast iron for RV110-130;Frame Color: silver or blue;Gurantee ...