SQ-C5.0-45 - 5.0 meter (16.4')The SQ C5. 0 90 is a 5. 0 meter (16. 4') diameter 12'' box truss circle. It is made from the same high quality 6082 T6 aluminum as the rest of our 12'' truss for high strength and a low self weight. The circle is comprised of four 90 arcs that can be purchased separately for custom designs or arch ways (please call for details). Features: 5. 0m circle (16. 4') 12'' aluminum box truss 2'' O. D. main tube 2MM (. 08'') wall thickness 8 x 45 arcs Connects