The dimensions of this threaded ring are as follows: inner diameter: 28Mm, outer diameter: 43.1Mm, height: 7.6Mm. Please check the size before purchasing. To obtain an overview of the size of the image, please search for the image in the product details.The threaded ring is made of plastic. This insulation material has advantages such as good heat resistance, low flammability, and waterproofing. The product has also passed Ce and Ved certifications.The application of this threaded ring is very practical as it can not only be used as a substitute for damaged threaded rings, but also for connecting/fixing new lampshades or lampholders. It can be assembled through bedside lamps, desk lamps, and floor lamps.You can use these threaded rings when decorating your home/store. By using threaded rings, you can perfectly assemble lamps and lampshades, and achieve Diy.