Install three mailboxes with a multi-unit solution! Spreader bar allows you to mount up to three mailboxes on a single post. Bar is crafted of heavy-duty, 12-gauge galvanized steel for long-term strength. Post features a durable, powder-coated finish. Locking bolts are included. Compatible with Mail Boss mailboxes, mounting posts and most existing mailbox posts. Mail Boss (TM) 3 Box Spreader Bar, 34in.H x 5in.W x 2in.D, White is one of many Mail Sorters available through Office Depot. Made by Mail Boss.