This lot of 10 Steel City 59361 1/2 electrical box extensions is perfect for any room and application where electrical wiring is needed. With a rectangular box shape and 8 knockouts, these gang boxes are made of durable metal material. The item length is 4 inches, item height is 1-7/8 inches, and item width is 2-1/8 inches. The voltage range is 101-150 V and it has a single pole. These extensions are great for adding extra space for wiring in any electrical project.