Base type: E27. 1 x E27 Lamp holder as your choice. They could assemble to a socket and cord for a hardwired lighting with an exposed bulb for an early 1908s era feel. Portable E-27 screw-on bulb holder.
Fdit E27 Socket Adapter E26/E27 Vintage Industrial Ceiling/Wall Light Base Holder Pendant Bulb Lamp Screw Socket(Gold)
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