Duplex sprockets, 1.chain sprocket,standard sprocket 2.Zinc plated,hardend teeth 3.stainless ... : 35-3 ~ 240-3 Quadruplex: 40-4 ~ 240-4 2) B series chains sprocket: Simplex: 04B-1 ~ 48B-1 Duplex: 04B ... ,•Black Oxide Finished,•Zinc Plated,Phosphating, Our factory, CompanyTianjin Haorongshengye Electric Equipment Co.,Ltd.Contact personAnna ZhangPhone86-15102249548Fax86-02227342567Websitehttp://www.tjhrsy ...