Back Spacer Iron Finish Electroplated Overall Length 2 3/4 in Overall Width 2 13/32 in Overall Height 13/16 in Compatible Conduit Trade Size 2 1/2 in Compatible Conduit Type Rigid RMC Compatible Nominal Conduit/Pipe Size 2 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