This 4-inch 2 1/8" deep square box is an essential electrical installation component that provides standard electrical boxes for construction. Constructed from durable galvanized steel. Features pre-punched 1/2" 3/4" knockouts and mounting holes for easy installation. This versatile box can be used in both residential and commercial applications. Perfect for electricians and contractors UL listed. We also have the shallow boxes and extension rings in our other listings. We don't have all the parts you use, but we have all the parts you use the most at great savings! Additional Details ------------------------------ Product description: This 4-inch 2 1/8" deep square box is an essential electrical installation component that provides standard electrical boxes for construction. Constructed from durable galvanized steel. Features pre-punched 1/2" 3/4" knockouts and mounting holes for easy installation. This versatile box can be used in both residential and commercial applications. Perfect for electricians and contractors UL listed. We also have the shallow boxes and extension rings in our other listings. We don't have all the parts you use, but we have all the parts you use the most at great savings!