The Westinghouse threaded socket ring is designed to easily secure a glass shade on a fixture without the use of conventional thumbscrews. Sturdy aluminum construction makes this ring the first choice for use on mini-pendants, fixtures or ceiling fan light kits with medium based threaded socket.
https://www.amazon.com/Westinghouse-Lighting-7000100-Aluminum-Medium-Base/dp/B009E9V3YA