1)Material :low carbon steel (ST12) 2)Certificate:ISO901:2008 3)OEM stamping, welding,plating,et 4))High precision washer OEM and customized apptoach services offered Chongqing dianyuan machinery parts Co., Ltd is located in the one of developing city of china,which is a industry and trade incorporate enterprise specialized in production and export of General machinery products, the main products ...