Steel City 53151 1/2 3/4 Pre-Galvanized Steel Square Box Extension Ring with 1/2-Inch and 3/4-Inch Knockouts

Product description STEEL CITY Drawn Construction Square Box Extension - Steel, 4' x 4' x 1-1/2' D., 22.5 cu. in. (8) 1/2' knockouts and (4) 3/4' knockouts on sides. UL (Underwriter's Laboratories) listed. - Construction: Drawn, Width: 4', Height: 4', Depth: 1-1/2', Cubic Inches: 22.5 cu in, Material: Steel, Shape: Square, Knockouts: (8) 1/2' & (4) 3/4', UL Listed: Yes, Pkg Qty: 1 From the Manufacturer The Steel City 53151 1/2 3/4 is a pre-galvanized steel square box extension ring that has a 4-Inch diameter and is 1-1/2-Inch deep with a 21-Cubic Inch capacity. On each side and both ends of the ring there are two 1/2-Inch and one 3/4-Inch conduit knockouts. The extension is used when you need to add wire capacity and mounts directly on top of the square box so additional circuits can be ran. Steel City is the industries leading product line of metallic switch and outlet boxes used in electrical construction. Since 1904, its products have represented the highest quality standards in manufacturing and innovative design, with one of the most complete offerings available.