Hubbell-Raco 255 3-1/2-Inch Deep Square Electrical Box, 

Welded with FM Stud Bracket, 

(10) Concentric Knockouts

RACO 3-3/4 in. Square large capacity box is used in walls or ceilings where multiple conductor runs are split into two or more directions to bring power to a number of electrical devices. With the proper cover, it can also be used to support a light fixture. Box measures 3-3/4 in. Square by 3-1/2 in. deep and features a fm style mounting bracket with a flush setback for use on wood or metal studs/joists.