This 4-inch metal round cover is designed to fit standard electrical junction boxes and features a 1/2-inch knockout (KO) for conduit or cable connections. Made of durable galvanised steel, it provides strong protection for wiring while resisting corrosion. The centered KO allows easy installation of fittings or connectors, making it ideal for branch circuit extensions. It helps maintain code compliance by securely closing unused box openings. Suitable for residential, commercial, and light industrial use, this cover is UL listed for safety and reliability.