... .ISO 9001-2000 2.Material:A3#and1045 # 3.OEM Products and Good quality 4.26-year manufacturing Main information about our ... .....420,428,520,428H, 525, 530 etcMaterial1045 steel, 1023 steel and 16MnSurface-finishingSandblasting, Dull polish, Galvanized, with the circle line in ... offer: OEM Service Offered Design Service Offered Buyer Label Offered roller chain and sprocket