... section:300x300mm,etc 4.wedding roof truss,lighting truss square screw truss system detail: Truss Material: Aluminium6061-T6 or 6082-T6 ... Length Available: 1m/2m/3m/4m,customized Truss ... stage,folding stage,bleachers seats,layer truss,background truss,speaker truss,LED truss,scaffolding,DJ flight case,aluminum bar desk ...