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Product Description Mounts Mail Boss locking security mailboxes on one steel mounting post. Made of 12-gauge galvanized steel, the spreader bar provides a sturdy multi-unit solution. Durable powder-coated finish. The 3 Box Spreader Bar allows you to mount three (3) Mail Boss locking security mailboxes on one post. Compatible with Mail Boss Mounting Posts and most existing posts. Made of 12-gauge galvanized steel, the spreader bar provides a sturdy multi-unit solution. Features powder-coated finish. From the Manufacturer The 3 Box Spreader Bar allows you to mount three (3) Mail Boss locking security mailboxes on one post. Compatible with Mail Boss Mounting Posts and most existing posts. Made of 12-gauge galvanized steel, the spreader bar provides a sturdy multi-unit solution. Features powder-coated finish.