10Pcs Octagon Galvanized Electrical Box Cover with 1/2 Inch Knockout

10-Piece Value PackAdequate quantity for bulk construction, maintenance and replacement of octagon electrical box covers. Cost-effective for electrician projects, home and commercial renovations. | Galvanized Steel MaterialHigh-hardness galvanized steel for octagon box covers ensures rust & corrosion resistance, ideal for damp or concealed installations with longer service life. | 1/2 Inch Standard KnockoutFits mainstream wire pipes and accessories for 4-inch electrical boxes perfectly, no extra drilling required to simplify installation and boost efficiency. | Multi-Box CompatibilityCompatible with 4-inch octagon, round and square electrical boxes, replacing single-spec covers to reduce inventory pressure. | Blank Flat DesignSmooth blank surface allows flexible modification for octagon electrical box covers, with polished edges to prevent scratches, suitable for DIY and professional use.