Mount 2 mailboxes on one post easily with the Architectural Mailboxes Duo Spreader Plate. Made of 14-gauge steel and designed with a 4- x 10-inch bolt pattern to fully support both boxes.About Architectural MailboxesBased in California, Architectural Mailboxes is the net result of two dedicated designers putting their heads together to create a superior product. Vanessa Taylor and Chris Farentinos are in charge, creating high-quality USPS-approved mailboxes with curb appeal that matches their functionality. You'll find top-notch materials, unique colors and finishes, and both traditional and new designs. Color: Black,Pearl Gray,Sand,White,Bronze.