IS216T - Medium Base Single Light One Piece Bottom Turn Knob Phenolic Incandescent Light Socket - E26 Lamp Base - 1" Base Diameter - 1.58 Inch Overall Height - Wire Leads or Screw Terminals - 660 Watt 250 Volts Max - 1/8" IPS Tap Extrusion Mounting - Black Phenolic - cULus Listed IS216T