Product Description Double It Up...Ideal for sharing, or multi-family units. This classic will stand the test of time and the test of kids. From the Manufacturer Double it up - Ideal for sharing or multi-family units. This classic will stand the test of time and the test of kids. Mayne mail posts install easily over a standard 4 by 4 wood post. Bury about 2-3-Feet in the ground and leave 4-Feet above the ground. Slide the decorative sleeve over the post, assemble the paper holder arms and attach them to the post, then secure your mailboxes of choice to the arms. Mailboxes can be bolted directly to these arms using a standard nut and bolt combination.