USG's 1-1/2 in. x 12 ft. Donn® DX® 15/16 in. HRC Galvanized Main Tee is engineered for efficient installation and reliable load support for acoustical panels, lighting fixtures, and air-handling components. Precision roll forming helps maintain straightness and uniform connections across long spans, reducing installation adjustments. Designed for commercial and institutional ceiling applications, this main tee supports consistent performance and a professional finished result across high-volume ceiling grid installations.