The DONN SDX/SDXL Ceiling Suspension System offers maximum economy, simplicity, and accessibility. It's hot-dipped, galvanized steel construction provides corrosion-resistance and ensures paint adhesion. Working together with USG ceiling panels, they form the fastest-installing ceiling systems in the industry. Both the commercial remodeler and the DIY will find ceiling installation easy with the patented QUICK-RELEASE cross tee clip. The clips are easy-to-remove without tools, minimizing tee damage. An audible click when securing tee-to-tee connections ensures accuracy. The tight USG main tee splice yields sturdy, square ceilings. Flange width: 15/16''. Color: White. No. SDX/SDXL216: 1'' x 2', fire resistant No. SDX416-050: 1'' x 4' No. SDX422-050: 1-1/2'' x 4' No. SDX/SDXL424: 1-1/2'' x 4', fire resistant