To be used with CeilingMax Surface Mount Grid System . Uses snap-in technology to easily mount your ceiling to any surface gaining headroom. Works with any 2' x 2' or 2' x 4' ceiling tile up to 3/4" thick. Fastens to joist, plaster, or drywall. Saves up to 6" of ceiling height. No need for wires or leveling. Made of high-grade PVC, which is easy to cut. Does not rust or show scratches. Easy 1-person installation. 25 year limited warranty. Class A fire rated. Dimensions: 23" x 15/16" x 15/16". Color: White.