Mic Worm Wheel Gearbox NMRV+NMRV30/40 1.Housing:Aluminium Alloy 2.mini gearbox 3.OEM Mic ... Worm Wheel Gearbox NMRV+NMRV30/40 Specifiction: Type:Worm Gear Speed ReducerModel:NMRV+NMRV30/40 Ratio:1:7.5,10,15 ... ,20,25,30,40,50,60,80,100Color:Blue/Silver Or On Customer RequestMaterial: ...