Outer Diameter: 30mm/1.2inch; Inner Diameter: 13mm/0.5inch; Color: Gold, Rose Gold, Bronze; Material: Copper; Plastic; Applicable Opening Size: 23mm-24mm; Package List: 3 x Round Sink Ring (1pc of each color) Advantage: The overflow cover is made of copper material, with fine workmanship, smooth surface, corrosion resistance, easy to clean and durable. It has a stylish and bright appearance, equipped with decorative overflow holes that prevent clogging. The coating adheres well, resulting in a delicate and uniform color. Wide Application: The overflow ring is widely used for sink, bathtub, bidet and washbasin. Suitable for home, office, kitchen, bathroom, dormitory, hotel, shopping mall, factory and various places. Instructions: Easy to install, just push it into place, no tools are needed. Don't worry about pushing it, it won't damage your sink. NOTE: The sink overflow cover is suitable for holes from 23mm/0.86in to 24mm/0.94in, please make sure it fits your sink before purchase.