This 2 meter length of self coloured, single-finned aluminium tube works with all of our 25mm square tube system fittings and accessories. The single fin is often used on horizontal tube frames to support a glass or wood shelf on all sides instead of using shelf or glass clips, as the fin enable the glass or wooden shelf to sit inside the square tube framework and helps to protect the edges. PRODUCT FEATURES Self Coloured Aluminium ProFrame aluminium tube with fin, ideal for holding thin timber board or any other board. Easy to install and operate, simply slide in boards to place within the fin. Available in black or aluminium steel.