PF/WPF series,Planetary Gear Reducer,Planetary Gearbox cylindrical external shell, small volume, compact structure. PF/WPF SERIES,Planetary Gear Reducer,Planetary Gearboxcylindrical external shell, small ... volume, compact structure, output end planPlanetary Gear Box,Planetary gear reducer,Planetary reducer,gearbox,gearmotor Featurescylindrical external shell, small volume, compact structure, ...