Tri Truss (290 mm) 290mm Truss is one of the most widely used truss in Australia. Perfect for general use over short runs, 290mm truss is used for DJ / band lighting trusses or small to medium shows where roof height or sight lines are an issue. All of our 290mm trussing use the higher strength 6082 composition aluminium and feature 2mm wall thickness. Tubes are 2 inch (50mm), standard for most clamps used .