Special Lite Products SPK-600-BLK Ashland Post and Burial Kit, Black Decorative mailbox post Maintenance free cast aluminum Powder coated finish 7 1/2" Diameter Base x 62" H Pole Cast Aluminum Pole + plus mailbox mounting arm Decorative cast aluminum curbside mailbox post with a durable powder coated finish. The adaptable Ashland Mailbox Post offers several options for installation. Each is provided with mounting hardware to attach them to a new concrete pad (surface mount) and a bolt on 18" direct burial post for installation into new concrete.