1,aluminum truss,spigot truss, 2,different size 3,light truss,stage truss,build truss 4,long history factory,good credit Material size details: 150*150mm,200 * 200mm,300*300mm, 350*350mm,400*400mm ,300*400mm,450*450mm,500*600mm, 520*760mm,600*760mm etc.spigot to connect the standard aluminum alloyFrame :4,3,2 Type: 4,3,2. Material: Aluminum 606,160,636,082 Head (diameter * thickness): 50 * 3mm ...