400*400mm spigot-type square truss 1.large loading,corrosion resistant 2 ... .easy to set up 4.15-25 service year 400*400mm spigot-type square truss Shape:Can be Square / Triangle / ... ISO9001 Size available : 200*200mm,250*250mm ,300*300mm ,350*350mm ,400*400mm ,289*289mm,389*389mm,400*400mm,450*450mm,500*500mm ... please contact me for more details.Mobil no. 13610346332 400*400mm spigot-type square truss