4 electrical outlet box reduced to 3/0 outlet box plaster ring"

4.3 Cu. In. 4" electrical outlet box reduced to 3/0 outlet box plaster ring - Quick change/assemble cover screw holes and slots, machine tapped fixture holes, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - Cover for Allied Moulded 4" round outlet boxes (9350, 9351, 9364, and 9365) with provision for 3/0 outlet profile and use with 1/2" drywall - Fiberglass reinforced polyester - thermoset box - Size: Depth=5/8", Dia=4" - Mount with 2 screws