Leviton Lamp Holder, 1-Circuit, 1-Piece, Keyless, 660 W Lamp, 250 V, Incandescent Lamp, Medium Base, 2-Terminal Screw Terminal, Bracket Mounting, Porcelain Body, Aluminum Shell, White, Unglazed, 1.38 in Overall Diameter, 1.52 in Overall Depth, UL E3810, CSA LR-1863, NOM 057. Leviton Lamp Holder, 1-Circuit, 1-Piece, Keyless, 660 W Lamp, 250 V, Incandescent Lamp, Medium Base, 2-Terminal Screw Terminal, Bracket Mounting, Porcelain Body, Aluminum Shell, White, Unglazed, 1.38 in Overall Diameter, 1.52 in Overall Depth, UL E3810, CSA LR-1863, NOM 057. Medium Base, One-Piece, Keyless, Incandescent, Unglazed Porcelain Lampholder, Bracket Mount, Single Circuit, Back Wired, White