Gibraltar Mailbox & Post is a standard size polymer mailbox and post combination designed for durability and convenience. It features a virtually indestructible double wall plastic construction that ensures long-lasting use. The mailbox includes a rear door for safe mail retrieval, keeping both children and adults away from traffic. It is spacious enough to allow magazines to lay flat inside. This fully assembled, weather-resistant unit installs quickly and easily by sliding over a new or existing 4x4 post (not included). The mailbox measures 49.875 inches in height, 10.125 inches in width, and 20.75 inches in depth, and comes in a sleek black color. USPS and backed by a 90-day manufacturer’s warranty, this mailbox & post combination both practicality and reliability. Model Number: GCL10000B