36 PK Steel City 53151 New 4" Square Steel Box Extension Ring, Open Box 36 PK Steel City 53151 New 4" Square Steel Box Extension Ring, Open Box The Steel City 53151 is a new 4-inch square steel box extension ring designed to expand the capacity of standard electrical outlet boxes. Made from pre-galvanized steel, it offers excellent corrosion resistance and durability for long-term use. With a depth of 1-1/2 inches, it adds 21 cubic inches of space to existing boxes. The extension ring features an open box design for easy wiring access and installation. It includes 17 knockouts?11 for 1/2-inch and 6 for 3/4-inch conduit?positioned on the sides, ends, and back for versatile conduit entry. Ideal for new or retrofit commercial and residential electrical projects requiring additional wire space. 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)