The 4 Inch Round Mounting Bracket is a practical and versatile solution for installing 4-inch diameter lights. Made of black powder-coated steel, this bracket can be bolted or welded into place, ensuring a secure and durable installation. It fits most Peterson Light Series, including models 411, 413, 415, 417, 418, 424, 425, 426, and 427. Additionally, it is compatible with grommet-mounted and flange-mounted lights. To complete the installation, the Peterson 426-18 Grommet is required (sold separately). With its reliable construction and compatibility, this mounting bracket is an excellent choice for your lighting needs.