Single Sided and Double Sided Cantilever Towers have holes on both sides to enable you to build Single Sided and Double Sided Rack Systems. A Single sided Rack system will often be places against a wall. This allows you to stock and pick your product from your cantilever rack system from only one side. A double-sided cantilever rack system will allow you to store product on both sides. This enables you to increase your storage capacity substantially while minimizing the amount of floor space required in your warehouse.