4-11/16" Square Extension Ring, 1-1/2" Deep, Drawn, Metallic4 11 16" Square, Extension Ring, Drawn, Metallic. Depth: 1 1 2". Side Knockouts: (8) 1 2" & (4) 3 4" . Cubic Inches: 29. 5". 4 11 16 in. Square Extension Ring, Drawn, 1 1 2 in. Deep with Eight 1 2 and Four 3 4 in. KO's Combination screw heads provide for faster installation. TKO knockouts allow for design and installation flexibility. Drawn steel construction 4 11 16 in. Square x 1 1 2 in. deep Supplied with eight (8) 1 2 in. and four (4) 3 4 in.