Since 1962, Arc-Co Electrical Boxes and Fittings has been manufacturing quality UL approved electrical boxes and fittings for the electrical and construction industries. Our manufactured designs include 4 11/16 inch squar......Since 1962, Arc-Co Electrical Boxes and Fittings has been manufacturing quality UL approved electrical boxes and fittings for the electrical and construction industries. Our manufactured designs include 4 11/16 inch square electrical boxes, 4 inch electrical boxes and a wide variety of gang box configurations. All electrical boxes have multiple concentric knockouts to provide more flexibility in the field and less inventory. In addition, Arc-Co manufactures a full line of box covers, adapters and extensions. Our manufactured accessories include steel straps, beam clamps, conduit hangers, conduit spacers, conduit body covers, drop ceiling box hangers and metal stud box hangers. Manufacturing materials include galvanized and stainless steel.