Back Spacer Iron Finish Electroplated Overall Length 8 1/16 in Overall Width 3 7/16 in Overall Height 1 1/32 in Compatible Conduit Trade Size 4 in Compatible Conduit Type Rigid RMC Compatible Nominal Conduit/Pipe Size 4 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