Extension Rings are manufactured from durable pre-galvanized steel, and are designed to house and protect electrical wiring, switches, receptacles, and to support light fixtures. All steel octagon boxes are UL listed and acceptable for use in 2-hour fire rated walls and ceilings. 8-32 fixture mounting screws are assembled.
- 4 in. square x 1-1/2 in. deep
- Welded steel construction
- Supplied with six 1/2 in. and six 3/4 in. knockouts
- Combination Phillips/slotted screw heads
- 30.3 cu. in. capacity