We stock a wide a range of tube fittings to connect your balustrade. A balustrade is like a jigsaw! You should take care to ensure that the fittings that you purchase match your tube. The fittings are designed to fit tube that is either: internal or external, 42mm diameter or 48mm diameter, 2mm or 2.6mm wall thickness. If you have any doubts, then please contact our sales team.