Koizumi Ceiling Light Retro Lighting Electric Shade 60W Compatible with Hook Ceiling It was attached to a square hook ceiling until removed, and I was able to use it with an LED light bulb. All the necessary parts for installation are included. The diameter of the white part is about 13 cm. Non-smoking, no pets. If you want multiple, there are 3 more in stock, so please consult with me. (They are from the same period, but the condition may vary slightly, such as yellowing.)