The TRUCK-LITE 45 series 3.5" x 5" rectangular open back grommet in black is designed to provide a secure fit between the light and its mount. Its open back design enhances airflow and component cooling, which aids in maintaining optimal performance. Constructed from durable materials, it offers an extended lifespan. It simplifies maintenance by allowing easy access to the back of the light. It is built to meet demanding heavy duty operating conditions with consistent, reliable performance.