The Handy Post Combo (mailbox, planter and flowers not included) sleeve is constructed of maintenance-free and durable PVC (Vinyl) and comes with a Lifetime Warranty against peeling, flaking, blistering, corroding, rotting 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 or sign is secured to any type of wood 4x4 configuration, you can modify it by cutting it to a straight up 52" height or less to accept The Handy Post Combo. The Handy Post Combo is multi-functional as the arms are fully adjustable up and down and may be installed parallel or perpendicular to each other as desired. The arms will accommodate up to 50lbs each with no sag and can accept planters and signs up to 16" wide. This aesthetically pleasing, economical product will enhance any home or business property. Upgrade your old wooden 4x4 mailbox or sign post and hang your home or business address sign in style or display a flower arrangement in your yard. The Handy Post Combo will add character to any setting. Conveniently packaged with stainless steel hardware and installation instructions included.