The Steel Mailbox Mounting Board, the tough, no-nonsense mailbox accessory that makes installation quick, easy, and rock-solid. Designed to fit all post-mount Architectural Mailboxes and 4x4 wood posts, this heavy-duty mailbox mounting bracket takes the guesswork out of setup. Its smart design features multiple mounting hole patterns for a perfect fit with other mailbox brands too, making it one seriously versatile mailbox add-on. Crafted from galvanized steel and finished with a sleek, black powder coat, it’s built to handle years of weather without breaking a sweat. With all mailbox hardware included, it’s strength, style, and simplicity all in one smart upgrade.