Back Spacer Iron Finish Electroplated Overall Length 7 21/32 in Overall Width 3 9/32 in Overall Height 15/16 in Compatible Conduit Trade Size 3 1/2 in Compatible Conduit Type Rigid RMC Compatible Nominal Conduit/Pipe Size 3 1/2 in Create the Space Between the Conduit and Mounting Space Elongated Bolt Holes Wet Location For Use With Conduit Mounting Type Screw On UL Listed Clamp Back