Plastic Lamp Holder with two screw rings and male thread - White (E27) - Kynda Light
F519 E27 Lamp Holder with screws - Sockets - LEDLight
Lamp Holder Adapter for Bulb E27 to B22 Lamp Socket Bulb Socket Adapter Converter Base Conversion Socket - Amazon.com
LH0455 BA15d double contact bayonet base lamp holder/socket to E26/E27 medium base lamp holder/socket adapter
Porcelain E27 lamp holder kit
Screw E27 Light Bulb Lamp Holder Base Pendant Socket~3653 – LEDSone UK Ltd
Amazon.com: Bahong Smart WiFi Light Socket,Smart Home Mini Socket,E26/E27 Lamp Bulb Adapter with APP Remote Control Timer,Wireless Remote Control Lamp Holder,Only Support 2.4GHz Network (1PC) : Industrial & Scientific
QIACHIP Bluetooth Smart Remote Control Light Socket E26 E27 Bulb Adapt