Vintage Industrial Lamp Light Bulb Shiny Black Holder E27 Light Socket – LEDSone UK Ltd
E27 Plastic Batten Holders, ES bakelite angle batten holder
electrical - How do I affix wires to an E27 T210 lamp holder? - Home Improvement Stack Exchange
E26 Socket, Ceramic Standard Medium Screw Socket, E26 E27 Bulb Lamp Holder, E26 Light Socket with 12 inch Wire Lead for Halogen Incandescent LED Light Bulb (12 Pack) - - Amazon.com
Amazon.com: plplaaoo E27 Base Adjustable Wire Vintage Pendant Light Holder, Lamp Holder, with Pull Chain Switch Lamp Base Ceiling Mounted, for Kitchens, Dining Rooms, Bars and Restaurants (Silver) : Tools & Home