2-1/8" deep with 4" square boxes with metal stud brackets and (4) 1/2” & (5) 1/2”-3/4” side knockouts and (3) 1/2” & (2) 3/4” 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 and keep the boxes upright for an effort less conduit connection.