This 400*400 aluminum alloy spigot truss is made by our experienced staff, we gurantee ... ,with length range from 1-4 meters.2. The material of this truss is 6061-T6 or 6082-T6,maximum span ... certificated,which can gurantee u peace of mind about our product quality.6. Suits for out-door venue,big and medium concert ... ,500*500mm,520*760mm,600*760 mm etc. 400*400MM Aluminum Alloy Truss