... this box is a part of transfer case of corn binder processing: precision forging material: 20CrMnTi ProductsAll kinds of gears (spur ... , hardening and tempering, Nitriding, high frequency treatment, black of oxidation, zincing.FinishingSand blasting , polishing , plating , acid ... on teeth of gear.CertificateISO9001:2000Minimum quantityAccept trial order gearbox for transfer case of corn binder