The Berkshire curbside mailbox presents an impressive face. The one-piece cast aluminum door features deeply cut details with a rich, leather grain textured panel. The stainless steel spring hinge and magnetic catch will keep the door secure and the rustproof cast aluminum body construction creates a weather resistant mailbox. The wellington series mailbox post features a 3" x 3" x 72" smooth square post. Made entirely of aluminum with stainless steel components to eliminate rusting. Direct burial installation is required. This mailbox combination also includes an easy to install locking insert, to help protect from identity theft. Manufactured from rust-free powder coated aluminum, the lockbox firmly attaches to the bottom of the mailbox and cannot be removed without the key. The lockbox insert is easily installed with four screws (included). Consult your local postmaster regarding regulations governing the installation of locking inserts.