Gibraltar Gentry black plastic all-in-one mailbox and post combo. Constructed from virtually industructible and rust-proof double-walled polycarbonate plastic, the mailbox and post combination is also treated with an ultra-violet inhibitor finish to resist color damage from the sun. With its large capacity and convenient open compartment below, the Gentry accommodates plenty of mail, magazines, padded envelopes, and parcels. It also features a back door to retrieve mail without entering the street, making it ideal for high-traffic areas. Installs over an existing 4 x 4 post for a quick and easy set up and features a 5 year limited warranty. The dimensions are 50" H x 11.5" W x 21.7" D assembled.