What is this?The socket ring helps to secure the lampshade to the lamp, great for holding lampshades for your table lamps, pendant lights, floor lamps, chandeliers.What will I get?Material: Zinc AlloyPitch: 2mmThread Diameter: 20mm / 0.79"Size: 28mm x 7mm / 1.1" x 0.27"(OD*H)Fit for G9 Threaded Ceramic SocketPackage Content: 4 Pcs x Light Socket RingAre there any advantages of the product?Great replacement for your old or broken lamp holder rings. Durable and convenient for you to use.How to use it?Easy to install, just screw on the socket to hold lamp shade.What should I notice?Please measure your lamp holder size before purchasing, this socket ring is only suitable for G9 ceramic lamp holders with a thread diameter of 20mm, not compatible all types of G9 ceramic lamp holders.