Pre-punched Steel U Channel Sign Post for Export . specification for U-Channel sign post · Steel material conforms to ASTM A499, Grade 60. · All kinds of specification including 1.12lbs/ft, 2.00lbs/ft, 2.03lbs/ft, 2.08lbs/ft, 2.50lbs/ft ,3.00lbs/ft and more. · 3/8" or 7/16"diameter holes on 1"or 2" centers, punched full-length. · Available in hot-dipped galvanized or green painted.