This 400*400 aluminum alloy spigot truss is made by our experienced staff, ... services u can get Main features:1. The size is 400*400mm truss,main tube 50*3mm,brace tube 50*2mm ... etc. 7.Size avaliable: 220*220mm, 289*289mm,389*389mm,400*400mm,450*450mm,500*500mm,520*760mm,600*760 mm ...