... life time WJ series worm reducer with hollow shaftRV series worm gear reducer1.Ratio:7.5-1002.Configuration:worm shaft,worm gear,bearing,oil seal ... ,housing,worm wheel,coupling flange,oil gauge,oil plug3.Function ... .1~5.57.5~100585Wj13070m6250h131.5~7.57.5~100850 worm reducer