257H 4-11/16 in. square box, 2-1/8 deep, 1/2 and 3/4 Side Knockouts, Welded, w/Wood/Metal Stud Bracket, w/ Far-Side Support, Pigtail. Boxes are installed in ceilings or walls for lighting fixtures, switches or receptacles. Square boxes are used where multiple conductor runs are split into two or more directions to bring power to a number of electrical devices. Combination cover screw heads provide for faster mudring/cover installation.