Dimension: This socket ring is compatible with all E27 threaded brackets and will only fit 1-1/2 (38mm) diameter sockets; please check and measure socket size before purchasing High Quality Material: The lampshade adapter ring is made of high quality bakelite, which is insulating, heat-resistant, rust-proof and durable Easy to Use: Put the bulb into the lampshade first, and then fix it with the lampshade ferrule; you can complete the installation by yourself in a few minutes, no need to seek the help of an electrician; it is best to cut off the power before installation to ensure safety Packing: 20 shading rings, enough for your daily use and replacement; each ring is 1-1/2 (40mm) inside diameter and 2-1/4 (58mm) outside diameter Wide Applications: Light ring adapters are designed to add beautiful hues to a variety of lamps, such as wall lamps, floor lamps, rope lamps, table lamps, and more, bringing a beautiful decorative touch to your home