Complete Trussing Circle. 50mm Tube Size. Supplied in Sections for Easy Transportation & Storage. Available in 3 Diameters. Complete circles made from the TRIO 290 truss section. Three sizes are available- the two and four metre diameter sections are in four pieces and the six metre circle is split into eight pieces. These circles give you an instant rig or platform for securing lighting or other fittings. TRIO290 CIRCLE 2M: 32KG TRIO290 CIRCLE 4M: 48KG TRIO290 CIRCLE 6M: 82KG. trussing-trussing circle