1. Durable, no rusty. 2. easy to assemble & disassemble, transport & store. 3. Strong loading capacity. 4. competiv price 2012 hot 250*250mm aluminum box truss, spigot truss, stage truss Item No.CK-2525VSize250*250mmSingle Length0.5m1m1.5m2m2.5m3m4mSingle weight3.4kg5.57.6kg9.6kg11.5kg13.620.1MaterialAluminum alloy 6061-T6/6082-T6Main Tube(diameter*thickness) 50*3mmVice Tube(diameter*thickness) ...