1.High strength bolt with hexagon head 2.Used for steel structures 3.Apply to per international standard 4.High quality Sets of high strength large hex head bolt for steek structures1.Materials: carbon steel or alloy steel2.Property grade; 8.8s,10.9s3.Standard; DIN, JIS, ANSL/ASTM,BS,AS,NF,GB,ect.4.Main size: M16-M30 length according to the request of customersWe are professional fastener factory ...