Supports ANY SIZE mailbox The Handy Post Solo sleeve (mailbox not included) is constructed of maintenance-free and durable PVC (Vinyl) and comes with a Lifetime Warranty against peeling, flaking, blistering, corroding, rotting. abnormal discoloration and manufacturing defects. It is designed to fit over an existing or new wood 4x4 (actual 3.5"x3.5") post, or can fit over many no-dig supports of similar dimensions. If your mailbox is secured to any type of wood 4x4 configuration, you can modify it by cutting it to a straight up 41" height or less to accept The Handy Post Solo. The Handy Post Solo is designed to accommodate a single mailbox of any size. The cross arm is 15" across and 5" wide and will accommodate up to 75 lbs. The cross arm can also be turned parallel or perpendicular to the mailbox, allowing for the look of your choice. With online shopping on a seemingly endless climb, larger mailboxes will be desired and the Handy Post Solo will accommodate all sizes. This aesthetically pleasing, economical product will enhance any home, business or neighborhood property. The Handy Post Solo will add character to any setting. Conveniently packaged with stainless steel hardware and installation instructions included.