... to hung speakers,hung led screen,hung and lights3.they can used for exhibition,performance, ... outdoor celebration,Wedding Celibrate,performance,concert,events and so onMaterial1. hard pressed extruded aluminum alloy 6061/6063/60822 ... 500*500mm,500*600mm,520*760mm it depends on the load2. Main tube:50*3mm,50* ... screw or conical couple5. the different sizes and load capacity can be ordered in our factory ...