The 2 1/2 Inch Open-Back Grommet is a versatile and practical product that is available with or without a kit. It requires a 2 25/32 inch mounting hole and comes with a kit that includes a grommet, 142-49 plug, and grounding screw. This product can be purchased individually or as a kit. It is specifically designed for the installation of incandescent lights and fits most Peterson 142, 143, 162, 163, and 172 series lights. With its easy installation and compatibility with various lights, this grommet is a reliable choice for any lighting project.