The traditional shape of our Classic curbside mailbox is the only thing this mailbox has in common with a typical curbside mailbox. The solid cast aluminum construction, with thicker walls than our competitors, provides added strength, and the powder coated finish will maintain a lifetime of beauty. This Fresno 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 76" H Fluted Post. Includes decorative mailbox mounting bracket and cannon ball post topper and wrap around base.