... quality,easy installation 3.Layer truss factory 4.3 year guarantee Iron Layer truss for hanging speaker Layer truss specification: Scaffolding ... 6082T6MateiralIronTube surfaceGalvanizedMax loading1.5TonSingle length1m/2mProduct advantages:1.Layer truss is consist of pillar, horizontal pipe, diagonal ... , easy to use, credibility and economy cost.3.Surface process: Hot zinc galvanization or cold zinc ...