... NRV series worm-gear speed reducer,such NRV025, NRV030 gear reducer, gear speed reducer Features: 1) High quality aluminum alloy die cast gearbox 2) High accuracy worm gear and ... order color for silver, green, and other color8)model number:NR025,NRV30,NRV40,NRV050,NRV063,NRV075,NRV090,NRV110,NRV130 NRV SERIES WORM GEAR REDUCER