NMRV Worm Gearbox with High quality small size and high efficiency Our RV series speed gearmotor, 1) Small size, compact, lightweight, and saves space for ... low noise, high reliability and high efficiency 3) High quality aluminum alloy, elegant appearance, efficient heat radiation, high carrying ability 4) ... torque: 4~2320Nm 8) Transmission ratio: 5:1~100:1 NMRV aluminum alloy worm speed gearbox