The traditional shape of our Classic Curbside Mailbox is the only thing this mailbox has in common with a standard hardware store mailbox. The solid cast aluminum construction, with 20% thicker walls than our competitors, provides added strength and the powder coated finish will maintain a lifetime of beauty. This fluted Direct Burial Mailbox Post is made of durable cast and extruded aluminum with a powder coated finish for a lifetime of beauty. 3″ outer diameter x 77 1/2″ H Fluted Post. Includes decorative mailbox mounting bracket and pole topper.