... for quality products GeneralASTM Standard C635 confirmance main tee classification,commercial quality hot dipped galvanized steel ... 16” and 9/16” wide.Components1. Main tee:Standard profile double-web construction,length 142" and ... flexibility-Built-in expansions in the main tee for fire resistanceBenefits:-Protection against corrosion,rust, ... fixture placement-Limited lifetime warranty Ceiling T BAR