Mount 3 mailboxes on one post easily with the Architectural Mailboxes Tri Spreader Plate. Made of 14-gauge steel and designed with a 4- x 10-inch bolt pattern to fully support three boxes. About Architectural Mailboxes Based 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. * Spreader bar for multiple post-mount mailboxes * Use with Architectural Coronado and Bellevue boxes * 14-gauge steel with zinc-plated assembly bolts and nuts * 4- x 10-inch bolt patterns * Dimensions: 39L x 12D x 1.5H inches