This Metro post type wall mount set holds four 24" wide shelves and includes one post with brackets and double support for each shelf. All other needed components such as shelves, wall bolts or screws must be selected according to type of wall. Note: If shelving is to be the length of one shelf, order End Unit only. If two‐shelf lengths, order one End Unit and one Mid Unit; three lengths, one End and two Mid Units; four lengths, one End and three Mid Units; etc. End unit is model SW56C.