truss, stage truss, aluminium truss

There are standard size as 287 x 287mm, 387 x 387mm ladder truss, triangle truss, and square truss. The length can be 0.5 - 4.0m. According to the loading capacity, it can be classified light duty and medium duty, and both can be made of ¡±?0mm as main tube. The medium duty, made of ¡±?0mm, as inside tube, the light-duty, made of ¡±?0mm as inside tube. So the medium duty loading capability is better than light-duty.