Aluminum alloy RV075 NRV075 NMRV075 Worm Gear Reducer Worm Gearmotor has good heat-dissipating, lightweight, small size, compact structure. Power 0.55kw, 0.75kw, 1.1kw, 1.5kw, 2.2kw, 3kw, 4kw. Gear Reduction Ratios: 7.5:1, 10:1, 15:1, 20:1, 25:1, 30:1, 40:1, 50:1, 60:1, 80:1, 100:1. Output Speed from 14r/min to 186.7r/min.