Do you need to fill test holes in an electrical panel or any other steel or fiberglass enclosure? Omega carries easy to install enclosure hole plugs that you can install without tools. Our enclosure hole plugs are self-centering and feature a low-profile interior nut. We have them in a wide range of sizes, suitable for closing holes up to 4 ?”. Order your enclosure hole plugs today from Omega for the best selection and prices, and quick delivery.