Shop › STRUCTURAL STEEL COLUMNS Image 1 of 3 Image 2 of 3 Image 3 of 3 STRUCTURAL STEEL COLUMNS $350.00 4×4 square tube .250 wall 6×6 square tube .250 wall6×6 or 8×8 Top/Bottom Plates Add To Cart Added! 4×4 square tube .250 wall 6×6 square tube .250 wall6×6 or 8×8 Top/Bottom Plates