... ReducerSize No.:NMRV030-150Ratio:7.5,10,15,20,25,30,40,50,60,80,100Color:Blue/ SilverMaterial:Housing-Casting iron ... :Synthetic & MineralWorm gear reducer pictureDemension sizeInstallnation typeworking machine packingCertification NMRV+NRV doule worm speed gearbox