American Vertical Cable System by KeyLink employs the American-style flat top rail with cable strung vertically in a kit format. American Vertical can be paired with 2.5"x2.5" posts Key-Link Posts are not included and must be purchased separately. American Vertical Cable Rail Kits Rail Kits are packaged in a short, narrow but long box, and are un-assembled. Cables are pre-cut and connected to the top and bottom rails, and are packaged along with vertical support pickets, rail brackets, and a bot