This type truss is a middle conical coupler one made in our factory, adopting middle type conical connector, connect a conical spigot in the middle, use incl.R spring to fix. This product is light, easy to transport, favorable price,  install agilitily.The height is 1m, 2m, 3m.Be the same with exhibition truss, small lighting truss, audio truss, speaker truss, gentry truss. The most span is 16m. Also can be used for large or middle type light truss pillar.  Usually adopting T6061 type aluminum material, main tube is φ50*3mm,brace tube is φ25*2mm. But also can choose T6082 type aluminum materail for the special request of the clients, can make main tube φ50*4mm or φ50*2mm according to the loading.