OHLECTRIC 4-11/16" Square Steel Work Box Extension Rings 1-1/2" Deep with Twelve 1/2" & 3/4 KO |Made from Galvanized Steel, Fire Rated| Ideal for Wiring Connections, Housing Receptacle & Switches

Premium Setup: 4" Square Drawn Steel Boxes are made from high-quality galvanized steel and offer ample room for wiring connections, housing receptacles, switches, and electrical outlets. | Improved Design: Raised emboss boxes have eight 1/2" & four 3/ 4" knockout holes on the sides, intended to prevent plaster and drywall mud interference in device mounting during installation. | Fire Rated Assurance: Features fire-rated design for enhanced safety, our square steel work box extensions prioritize protection, ensuring compliance with fire safety standards. | Wide Application: These electrical steel boxes are cULus and ROHS certified for safety, and an ideal option for wiring connections, housing receptacles, switches, and other electrical devices | One-Stop Solution: Ohlectric is your one-stop shop for all electrical accessories, ranging from mounting plates to switch boxes that are widely used by contractors and electricians.