2-1/8 in D, 4-11/16 in Junction Box with (6) 1/2 in and (6) 1/2 to 3/4 in side knockouts and (2) 1/2 in and (2) 3/4 in bottom knockouts are larger boxes that are installed when larger sized conductors are required. These boxes are great for industrial applications. Garvin Industries 2-1/8 in D, boxes provide extra volume for wiring and devices.