500*500mm spigot-type square truss 1.large loading,corrosion resistant ... 3.easy to set up 4.15-25 service year 500*500mm spigot-type square truss Shape:Can be Square / Triangle ... ,400*400mm,450*450mm,500*500mm,520*760mm,600*760 0mm ,450*450 mm ,400*600mm,500*500mm ,500*600mm,520*760 mm ,600*760mm ... . Kindly please contact me for more details.Mobil no. 13610346332 500*500mm spigot-type square truss