E26 to E26 Socket Extender,E26/E27 to E26/E27 Lamp Holder Adapter
Amazon.com: Emart Light Bulb Stand, E26 / E27 AC Socket Lamp Holder with Umbrella Holder, Photography Light Bulb Mount for Photo Video Studio - 2 Pack : Electronics
Bakelite E27 lamp holder kit with switch
Fermaluce Metal with threaded E27 lamp holder, light point in metal