1.Worm gearbox, gearbox, gear reducer 2. ISO9001:2000, SGS,CE etc 3.Warranty ... :Blue/ SilverMaterial:Housing-Casting iron-HT200 -250#/ AluminiumWorm Gear- KK alloyWorm-20CrMnTi with carburizing and quenching, surface hardness ... , 71B5, 80B5,90B5,100B5,112B5,132B5Lubricant:Synthetic & MineralWorm gear reducer pictureDemension sizeInstallnation typeworking machine packingCertification NMRV+NRV doule worm ...