nVent CADDY Box Support, Heavy Duty Rigid, 4 in, 4-11/16 in Box, For Use With: 1-1/2 in, 2-1/8 in, 2-1/2 in, 2-7/8 in, 3 in, 3-1/4 in and 3-1/2 in D Box, Specifications: 3-Boxes, 16 in Stud Spacing, Steel, Pre-Galvanized