2-1/2 in D old work switch boxes have clamps for flexible metal conduits and (6) 1/2 in side knockouts and (2) 1/2 in bottom knockouts for EMT conduit connectors. The boxes are used to support toggle switches, duplex devices, decorative devices and a variety of electrical outlets where flexible metal conduits are installed. Garvin Industries switch boxes allow versatility of wiring design because they are gangable for multiple switches or device installations. Their plaster ears allow easy wall cut in when outlets or switches need to be added to existing hollow walls. GARVIN® Switch Box, Cut-In Gangable, (6) Side, (2) Bottom Knockouts, (6) 1/2 in Side, (2) 1/2 in Bottom Knockout, Shallow Hub, Steel, Hot Dipped Galvanized/Zinc Plated, 4.26 in W x 2.5 in D Dimensions