Southwire 4 In. 1/2 In. Knockout Gray Round Box Cover is designed to effectively close off 4-inch octagon boxes, making it i for use as a junction box, for adding wiring devices, or for mounting lighting fixtures. This flat blank cover features convenient keyhole mounting holes that simplify installation. Crafted from durable steel, it ensures long-term strength and reliability, while the zinc-plated finish enhances its resistance to corrosion and wear, providing lasting durability for your electrical projects. Model Number: 54C6-UPC