Square Box - 3 3 1 2 Octagon Box Extension Ring
You can place order: - 3-1/2" deep, 4" octagon boxes with (2) 1/2" & (2) 3/4" side knockouts and (3) 1/2" & (2) 3/4" bottom 1-1/2" and 2-1/8" Deep 4" Square Extension Rings with Conduit Knockouts 3-1/2" Octagon Extension Box, 1/2" KO's, 1-1/2" Deep - 3-1/2" deep, 4" square junction boxes with (6) 1/2" & (6) 1/2"-3/4" side knockouts and (2) 1/2", (2) 3/4" - 3-1/2" Octagon Boxes are 1-1/2" deep and are used in the installation of wall or ceiling lighting ...