... , 200mm, 250mm, 300mm, spigot truss series: maint tube is 50*2.0mm,the brace tube is 12*2mm.,350mm, 400mm, Spigot ... truss series:main tube is 50*3.0mm, the brace tube is 30*2.0mm.500*600m main tube is ... 50*30mm ,the straight pipe is 50*2mm,the brace tube ... 760mm main tube is main tube is 50*30mm ,the straight pipe is 50*2mm,the brace tube is 32*2mmWe ...