1.manufacture 2.1x19 or 7*7 construct Gavanized wire 3.Shinnng surface 4.Standard diameter 5. Zinc head/ Aluminium head 1.Quality:ISO90001,ISO14000 2.Standard: GB/T8918-1996, GB 1102-74, SC 1443-86, ISO, BS, DIN, JIS, API and RRW-410D Item Information Steel materials quality carbon spring steel ,60# ,65#,70#,72A,82B StandardISO ,DIN, ASTM,JIS , etc Tensile strength1770mpa,1570mpa,1670mpa,1860mpa, ...