2-1/8 in D, 4 sq-in boxes with vertical right angle brackets and (6) 1/2 in and (3) 1/2 to 3/4 in side knockouts and (3) 1/2 in and (2) 1/2 to 3/4 in bottom knockouts provide extra rigid support when attached to wood or metal studs. They are used when 4 sq-in 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 sq-in boxes with attached brackets allow a quick easy installation to structural members and keep the boxes upright for an effortless conduit connection.