2″ by 12″ Truss 2″ (50 mm) Outside Diameter X .065″ (1.6 mm) Wall with 1/2″ (12.7 mm) Webbing 12″ TRUSS (Outside Dimensions) 12″ Trusses are stocked in 6″ increments, however, can be manufactured to any specified length. Corners add: 24″ T junctions add: 36″