Features of NMRV series worm-gear speed reducer: 1.occupied little space 2.self locking 3.fast ... .good cooling effect NMRV series worm-gear speed reducer,such NMRV025, NMRV030 gear reducer, gear speed reducer Features: 1) High quality aluminum ... ,NMRV050,NMRV063,NMRV075,NMRV090,NMRV110,NMRV130 NMRV 130 worm-gear speed reducer