All of the Special Lite Mailbox Posts are manufactured from rust-proof cast aluminum. Each piece is Powder Coated to give it a chip-proof, fade resistant color. The Ashland Post offers several options for installation. It is provided with mounting hardware to attach it to an existing concrete pad and a bolt-on 18" direct burial post for new installation into concrete. Overall Dimensions: 62"H, 7.5" Base Diameter.