Landover mailbox post is made from rust-resistant aluminum and painted in a shiny, black powder-coated finish to prevent fading. adorned with a decorative finial, and steel crossarm this post can support up to 60 lbs. evenly distributed. the landover is designed to install over an existing 4x4 wooden post and is compatible with most mailboxes. mounting and installation hardware is included. assembly is required. assembled dimensions 56.4" x 6" x 21.4".