welcome to trussingchina - truss, stage lighting trussing
it is made by the aluminium material, its the international aluminium type of T6 6082 6061
the main tube for the truss is 50mm diameter , by thickness of 3mm ,
(for some special use it is by thickness of 2mm or 4mm or 5mm )
often each pcs truss length by 0.5m /1m/ 1.5m/2m /2.5m/3m/3.5m /4m , 0.1m~4m .

1)  spigot style truss, global truss, Europe truss, Thomas truss
2)  screw style truss, bolt truss
the lift system include the top piece/corner block/hinge section/floor base/support brace,
the full truss system is raise up&down by the chain lift hoist or electric motor .

the aluminium truss international standard models as :
model:200*200mm, main tube:25*2mm,small tube:15*1.5mm, safety span:8m, loading weight:150kg
model:220*220mm, main tube:25*2mm,small tube:15*1.5mm, safety span:9m, loading weight:200kg
model:250*250mm, main tube:25*2mm,small tube:15*1.5mm, safety span:10m, loading weight:300kg
model:289*289mm, main tube:50*2mm,small tube:25*2mm, safety span:12m, loading weight:450kg
model:300*300mm, main tube:50*3mm,small tube:25*2mm, safety span:12m, loading weight:500kg
model:350*350mm, main tube:50*3mm,small tube:25*2mm, safety span:13m, loading weight:600kg
model:400*400mm, main tube:50*3mm,small tube:25*2mm, safety span:15m, loading weight:700kg
model:450*450mm, main tube:50*3mm,small tube:25*2mm, safety span:16m, loading weight:800kg
model:500*500mm, main tube:50*3mm,small tube:25*2mm, safety span:17m, loading weight:850kg
model:400*600mm, main tube:50*3mm,small tube:25*2mm, safety span:18m, loading weight:950kg
model:500*600mm, main tube:50*3mm,small tube:25*2mm, safety span:20m, loading weight:1000kg
model:520*760mm, main tube:50*4mm,small tube:30*2mm, safety span:24m, loading weight:1100kg
model:600*760mm, main tube:50*4mm,small tube:30*2mm, safety span:26m, loading weight:1200kg
model:760*910mm, main tube:50*4mm,small tube:30*2mm, safety span:30m, loading weight:1250kg

please get the different style as :

spigot truss / global truss

square truss / bolt truss

strengthen truss

lighting stand truss