1.NMRV Aluminium Double Extension Worm Shaft with Flange Output Speed Reducer Worm Gearbox Reducer 2.Model: ... 5-1:100 Aluminium Double Extension Worm Shaft with Flange Output Speed Reducer Worm Gearbox Reducer Characteristics:(1) ... must be tested before sendingSpecifiction: Type:Worm Gear Speed ReducerModel:NMRV030Ratio:7.5,10,15,20,25, ... 100B5,112B5,132B5.....Lubricant:Synthetic & MineralGear & Shaft: