... .Material: stainless steel, carbon steel, iron. 2.Grade: 4.8, 5.6, 5.8, 6.8, 8.8, 10.9. 3.Finished: plain, zinc Material: stainless ... steel, carbon steel, iron.Grade: 4.8, 5.6, 5.8, 6.8, 8.8, 10 ... visiting and we look forward to the future with you. 4.8, 5.6, 5.8, 6.8, 8.8, 10.9 bolt and nut