1)ISO9001:2000 2)Carbon steel,iron,ss 3)zinc plated.hot dip galvanized,black,brass 4)2,4,5,6,8,10,12 The products here of only shows our manufacturing capabilities,if customers have any products of similar manufacturing methods,please send us the drawing and specifications ,We will give you an accurate quotation as soon as possible.Standard DIN ANSI/ASME, BS, GB, JIS, Non-Standard Material carbon ...