Detailed Product Description 1) Standard: ISO, DIN, BS, NFE, ASTM and ANSI . 2) Size:according to buyers' instructions3) Material: spring steel, stainless steel 18-8 SS / A2 304 SS / A4 316 SS 4) Class: high strength (heat treatment, hardened) 5) Finish (surface treatment): plain, black, oxide, zinc plated (white / blue / yellow), hot dip galvanized, nickel plated 6) Packing: Bulk or small ...