Our Kingston Curbside Mailbox has universal appeal with this smooth geometric styling accented with a simple decorative embossing. The low profile belies the spacious interior. The Kingston, like all of our mailboxes, is manufactured from rust-proof cast aluminum. The Springfield Series Mailbox Post is a 4" x 4" x 78" smooth square post with decorative finial and mailbox mounting arm. Made of durable aluminum construction with a powder coated finish. Direct Burial Installation required.