Aluminium Rectangular Tube. RS Pro Aluminium rectangular tubes are hollow tubes that are available in various widths and thicknesses. The rectangular tubes are used in trusses, bridges, cranes, beer-barrels, milk churns, transport and highly stressed applications. FEATURES and BENEFITS:. Aluminium rectangular tubes Hollow Formed as rectangular tubes Various widths available Various thicknesses available Various lengths available. APPLICATIONS:. Trusses Bridges Cranes Beer-barrels Milk churns Transport applications Highly stressed applications