18" x 12" manufactured the same way as 12" x 12", but has an added advantage, due to its width of 18" of being able to accommodate 2 lighting bars back to back. Also the truss is slightly stronger over longer spans. It is made from 6061T6 or 6082T6 alloy 2" x 0.125" tubes for the main chords and 1" x 0.125" tubes for the diagonals.The truss can be used with Ground Support System with suitable sleeve blocks and towers.