2-1/8" deep, 4" square boxes with flat vertical brackets and (9) 1/2" side knockouts and (5) 1/2” bottom knockouts are used when 4” square boxes must be mounted directly to wood or metal studs. Square boxes are used to bring power to a number of electrical devices where multiple conductor runs are split in two or more directions. Garvin Industries’ 4” square boxes with attached brackets allow a quick easy installation to structural members and keep the boxes upright for an effortless conduit connection.