... and down,quick and flexible3,Widely use for performance equipment,exhibition truss,display trussAluminum truss beam: Size and specifications:20X20cm ... , circleSafe span: 8mApplication: outdoor light truss, perfomance,fashion show ,exhibition, wedding, party, event, banquetThe following is our factory help ... to install outdoor truss stage for Music show at TV tower: truss system/truss sleeve block