... .Grade:4.8;5.8;8.8 3.Material:Carbon steel 4.Package:paper box;jute bag;wood case Connecting bolt ... : Great corrosion resistant, high intensity, long and durable Certificate:GB/T19001-2000---ISO9001:2000 and CE If you have any question,Please ... Building, Lingshanwei Town, Jiaonan City, Qingdao, ChinaPostcode:266427 DIN Carbon steel bolt and nuts