We are a manufacturer specializing in sign post,including galvanized square tube, u channel post,round post and sign blank Delivery to:USA,CANADAGalvanized Steel Square TubeSquare Sign Post:Steel plate: ASTM A1011 or ASTM A653 Grade 50 Structural qualityTolerance: Min yield strength: 50,000 PSI (340 MPa) Max tensile strength: 79,000 PSI (540 MPa)Galvanizing type: Zinc primer, hot-dip galvanized, ...