SWC 52171-WBBX 4Sq BktBx 2-1/8" (4)

2-1/8 in deep 4 in square boxes with wood spike vertical brackets and (2) 1/2 in (1) 1/2 in-3/4 in & (4) BX side knockouts and (1) 1/2 in bottom knockout are used when 4 in square boxes must be mounted directly to wood or metal studs. They are installed in walls or ceilings for lighting fixtures switches receptacles or other outlet devices where flexible metal conduits are used.