Approved by the Federal Highway Administration (FHWA) and The American Association of State Highway and Transportation Officials (AASHTO). They comply with the mechanical requirements for grade 60 steel of ASTM A499 and the chemical requirements for grade 1080 steel of ASTM A576. Features a ribbed back and flange for extra strength. Manufactured from the finest high-carbon new billet steel (grade SP-80), which is more reliable than conventional posts made of old rail steel. Available in 3 lengths.