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