Make a strong statement with our Westhaven post-and-beam style 4" x 4" aluminum square Mailbox post systems. Mailbox post system features a durable, low maintenance Black powder coat finish that will look great for years and comes with a Lewiston Cast Aluminum Mailbox, three cast aluminum address plates, support bracket, D?corative pineapple finial and square base. Westhaven Mailbox Collection is made of rust-free cast aluminum with a durable weather resistant finish. Three Cast aluminum personalized address plates are Black with Gold Numbers. Post mounts directly into ground, mailbox interior dimensions: 7 x 6.5 x 18. System color is Black.