Double Socket Mason Jar Lamp Adapter (4-Way Socket) - 3''W x 6''H360291
3''W x 6''H. This lamp adapter has two light sockets. Turn the switch once to turn on the bottom light. (2" candelabra base socket.) Turn the switch again to turn off the bottom and turn on the top. (Standard light socket.) Turn the switch a third time to turn on the top and the bottom lights at the same time.