Securely mount your mailbox to a vinyl post with ease with this high-quality mailbox support bracket. Designed with a mounting cavity of at least 7 7/8" x 11 7/8" this will work a wide selection of mailboxes and mounts directly onto a 2" x 3 1/2" vinyl rail. Made from sturdy and reliable white vinyl that will not warp, discolor, or fade overtime. Proudly manufactured in the USA