Cargo Bar with E- and A-Track Fittings is an inexpensive way to limit or avoid costly damage caused by shifting loads during transit. Cargo bar contains loads to assure safe arrival. Position in wall-to-wall or ceiling-to-floor formation. Ideal for truck or rail use. Steel 2 3/8x3" tube slides and locks inside a 2 1/2x3 1/2" aluminum tube at both ends. Each end has E- and A-track fittings.