Garvin 52181-OW 4" Square, 3-1/2" Extra Deep Old Work Junction Box, 1/2" & 3/4" Side Knockouts

4 in square 3-1/2 in Deep junction boxes with old work clips and plaster ears and (8) 1/2 in & (4) 1/2 in-3/4 in side knockouts and (3) 1/2 in (2) 1/2 in-3/4 in bottom knockouts are added to existing walls when deep devices (speakers strobes etc.) are required to update a structure. Garvin' labor saving design eliminates the need to awkwardly install boxes and extension rings to accommodate deep devices.