Steam punk Industrial Lamp holder Black Iron Pipe Lamp Socket 3/4" with wire E27 | eBay
E27 Lamp Holder Cable Plug | Bulb Holder Wire Plug | Light Bulb Socket Base Holder - Eu - Aliexpress
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