... pole 3. traffic products. 4. traffic accessories squareand u channel road sign post we are metal stamping factory ,road ... to cooperate with you . A.Square Sign Post steel sign postYield strength58,000 PSITensile strength63,000 PSIGalvanized StandardHot-dip ... galvanized steel, ASTM A653 G90Cross Section1.50", 1.75", 2. ...