Our products are strictly in accordance with the following standards to manufacture:din, iso, ansi, jis, as, nf and gb/t, ect.The strength grade can reach to 4.8-12.9, and steel structure can reach to 8.8s and 10.9s. Our products are widely used in the areas of steel structure, bridge, Railway, regular boat, car, electric power and uncleus engineering item ect. And the products have been being exproted to u.S.A, germany, canada, australia, korea, italy and japan ect. If you have the plan to purcahse the product above, please feel free to contact us! Bulk, and you can provide demands