Garvin Industries Masonry Boxes are 2-1/2" or 3-1/2" deep and come in both gangable and solid "one piece" construction.  These boxes are used when multiple switches, receptacles or outlets are required in one location in block walls.  Solid boxes can accommodate up to 9 devices.  Gangable boxes allow the installer to add extra device locations as required.  All boxes offer 1/2" & 3/4" concentric knockouts and many have labor saving installation brackets for quick mounting on wood & metal stud walls.