Application: Closure of Unused Box Outlets | Brand Name: Sigma Electric | Color: Silver | Diameter: 2.65 in. | Height: 0.33 in. | Material: Zinc Plated Steel | Number in Package: 1 | Packaging Type: Polybag | Shape: Round | Sub Brand: ProConnex | UL Listed: Yes Sigma is also the industry leader in outdoor weatherproof products from floodlight kits to innovative outlet covers that can be installed vertically or horizontally. All products in our weatherproof line are designed, tested and UL approved to meet or exceed all applicable NEC requirements for wet and damp locations. | Closes unused knockouts in a steel outlet box or metal enclosure | Knockout seals are used to close exposed holes | High-quality safety products