J&D Manufacturing's heavy gauge galvanized steel columns and up-posts are available in 2.875" or 4" outside diameter. Optional rust shields are available in 9" green poly or 18" galvanized to further protect your tubing from the elements. All rust shields are placed flush with the bottom of the tube. Special lengths and rust shield placements are available on volume orders and are non-returnable. Standard Column and Up-Post lengths are 5', 6', 6'6", 7', 7'6", 8', 21', 24'. Order by the bundle and save! Contact J&D Manufacturing for a custom quote on all tubing sizes not listed on the literature.