The Open Back Grommet is designed for 2 - 1/2 inch round lights with a convenient side wire opening. Made of cold resistant PVC with thermal plastic rubber, this grommet ensures durability and longevity. Its open back design allows for easy installation and maintenance. With a wire opening on the side, it provides a practical solution for wiring needs. Sold individually, this grommet is a reliable and practical choice for your lighting needs.