The 4 Inch Black Round Grommet is a practical and versatile product made of durable black PVC material. It is designed to flush mount 4-inch diameter round style lights in a 4 1/2-inch hole, fitting most 415, 417, 426, or 427 round stop, turn, and tail lights. With its universal compatibility, this grommet also fits most 4-inch lights. Its simple yet effective design ensures a secure and seamless installation, making it an essential accessory for any lighting setup.