Features:of NRV series worm-gear speed reducer 1.model number:NRV030-NRV130 ... .self locking 3.fast stop 4.good cooling ef NRV series worm-gear speed reducer,such NRV025, NRV030 gear reducer, ... speed reducer Features: 1) High quality aluminum alloy die cast gearbox 2) High accuracy worm gear and worm shaft 3) Less ... NR025,NRV30,NRV40,NRV050,NRV063,NRV075,NRV090,NRV110,NRV130 NRV SERIES WORM GEAR REDUCER