Bell Four Pack of 1/2 inch electrical box knockout plugs are a must-have accessory for your electrical box installations. This pack of knockout plugs is designed to provide a secure and professional finish for your electrical boxes, ensuring a clean and polished appearance. Crafted from durable gray metal, these knockout plugs are built to withstand the rigors of electrical installations. They are specifically designed to fit 1/2 inch knockout holes, offering a snug and secure fit. With their reliable construction, these plugs effectively seal off unused knockout holes, preventing dust, debris, and pests from entering the electrical box. Installation is quick and easy with the Bell's electrical box knockout plugs. Simply insert the plug into the knockout hole and secure it in place. The pack of four ensures you have an ample supply for multiple electrical box installations.