Bud Industries BudStack Rack is designed for all 19″ EIA rack-mounted applications and provides a high level of versatility. Bud Industries BudStack Rack can be used vertically for 17.5″ (10U) panel space or horizontally for 21.0″ (12U) panel space. Multiple units can be stacked together and attached vertically to create an uninterrupted panel space. BudStack Rack is shipped in a single carton and comes unassembled with all necessary components and hardware.