18 PK Steel City 531511234UB New 4" Square Extension Ring, 1-1/2" Deep, 21 Cu In 18 PK Steel City 531511234UB New 4" Square Extension Ring, 1-1/2" Deep, 21 Cu In The Steel City 531511234UB is a new 4-inch square box extension ring designed to increase the capacity of existing outlet boxes. It is made from pre-galvanized steel, offering excellent durability and corrosion resistance. With a depth of 1-1/2 inches and a total capacity of 21 cubic inches, it provides ample room for additional wiring or larger devices. The extension ring features 12 knockouts, including eight 1/2-inch and four 1/2-inch/3/4-inch eccentric knockouts, allowing for flexible conduit entry. It is UL Listed, ensuring it meets safety and performance standards. This extension ring is ideal for both commercial and residential electrical installations requiring extra box depth. Listed by: Caitlin (Sales Team) ?Experience is a hard teacher because she gives the test first, the lesson afterward.? ?Vernon Sanders Law (A positive moment brought to you by Help Resale) About Us Welcome to Help Resale, your go-to consignment shop where value meets quality. At Help Resale, we're dedicated to providing you with an exceptional shopping experience, whether you're looking to find the best deals or consign your items. Need to buy a product, but don't see it in our store? Please feel free to reach out to us and we will help you find it! Help Resale 7200 Fair Oaks Blvd Suite 120 Carmichael CA 95608 Business Hours: Monday-Friday: 9:00 am to 5:00 pm (PST) All product and company names are trademarks TM or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. (description exceeds maximum possible length)