A cantilever rack consists of four main components: the base, uprights, arms and supports. The base is heavy and often made of steel. It gives strong support and extends out from the bottom of the rack to counter-balance the heavy weight of the stored items.
The uprights are extremely strong vertical posts that support the arms. The arms themselves are the “shelves” that extend from the uprights. They store your inventory. Supports connect the uprights to give the racks extra strength.