Eaton Corp Crouse-Hinds series s Division has assembled one of the most complete outlet box product lines in the business. We've been leading in quality and selection for decades and throughout the steel outlet box offering, you will find innovative products and solutions that save labor, cut material costs and increase productivity. Our 4" steel square outlet boxes, covers and extension rings are for use with conduit and are ideal for exposed work applications. The boxes provide an easy method for the installation of electrical devices (switches, receptacles, fans, lights, etc.). The boxes are also available in red for fire alarm applications.