Electric Oil Lamp Adapter serves two purposes. enables oil lamps to support a harp type lampshade and converts oil lamps, with a #2 size collar, to electric. Use on oil lamps with a collar opening of: 1-3/16" ID, known as a #2. Conversion is achieved by simply unscrewing oil lamp burner and screwing electric oil lamp adapter into collar. No wiring is necessary, lamp wire exits from side of socket cap. Lamp socket is a 3-way turn knob type, providing three levels of light. Use with a 3-way bulb.