Device box. 3 in. x 2 1/2 in. x 2 in. Made of galvanized steel. Non-grouping device boxes are widely used for switch and receptacle installation in walls made of 2 x 3 or 2 x 4 studs. They are specially recommended for multigrouping applications, as they provide a straight installation each and everytime. 3 groupes and more models must be supported an each side. No ears. Depth tabs.