There are both aluminum quadrate tube and aluminum board as joint, but their functions are the same , they all implement the connecting among aluminum trusses . we mount with 8.8 degree's bolts of high intensity with 55mm thicker gasket.
Aluminum 6082 T6 50*3mm as main tube;30*2mm as standpipe and brace tube.
Carton+wrap
The sizes we now have 300*300mm (287*287mm). 400*400 mm (387*387mm), 450*450mm, 450*600mm. 520*760mm.