... HWB20Brief Introduct:Aluminum Square Circle Truss HWB201.Low weight,high load capacity2.Conical coupler truss3.Specification and shape are available4. ... Its main characteristic is of easy usage, quick installation, high load capability for audio, lighting, which meets a variety of requirements.circle ... set-up with best quality 2.light weight and high load capacity,and can be used widly to Event, Trade ...