... Gearbox Reducer 2.Model:RV030,Ratio:7.5-100 NMRV030 Ratio 1:7.5-1:100 Aluminium Double Extension ... to delivery on time(4) Large output torque(5) Safe,reliable, economical and durable(6) Stable ... sendingSpecifiction: Type:Worm Gear Speed ReducerModel:NMRV030Ratio:7.5,10,15,20,25,30,40,50,60 ... and quenching, surface hardness is 56-62HRCShaft-chromium steel-45#Packing:Paper carton (Plywood box) / per ...