Application: For Surface Conduit | Box Type: Ceiling | Brand Name: Raco | CSA LIsted: Yes | Capacity: 13 cu. in. | Color: Gray | ETL Listed: No | Height: 3-7/8 in. | Hole Configuration: 1 Gang | Knockout Size: 1/2 in. | Material: STEEL | Number in Package: 25 pk | Number of Gangs: 1 gang | Number of Knockouts: 2 | Shape: Rectangle | UL Listed: Yes | Weather Resistant: No Utility box extension rings provides a means to adding additional wiring capacity in the box. Handy boxes used for devices or small junction boxes. Popular with surface mount applications. | Handy Box Extension Rings | 1-7/8 in. Deep | Drawn with Conduit KO's | RACOÂ ® Handy boxes, also called utility boxes, are used for convenience outlets, switch boxes or small junction boxes