... :300x300mm,etc 4.wedding roof truss,lighting truss square screw truss system detail: Truss Material: Aluminium6061 ... diameter*thickness) 25mmx3mmConnection Mode: Bolt connectionTruss section Shape: square, triangle, layer,circle ,etc.Application:We can design ... to hang acoustics,speaker, lighting and so on.Features:Lighting truss hanging lights,loud speaker.Suitable ... bar desk,scaffolding,and so on.