Size Detail: Outer diameter of round ink hole overflow cover measures approx. 30 mm/ 1.18 inch. and the inner diameter measures approx. 20 mm/ 0.79 inch. about 16 mm/ 0.63 inch in height. fit well in standard 22-24mm overflow holes.6 drain cap covers are enough to use. also have spare parts for good replacement. Material: These round bathroom sink hole overflow covers are made of ABS plastic material. the lid is printed with chrome. looks modern and shiny. suitable for decorating the overflow hole. don't block it. can be used for a long time in the kitchen or bathroom.Better than the metal handle. quality and will not scratch your pond. Easy to install: Our sink overflow rings are easy and convenient to match with faucets. you just push and click to place them. putting some soap on it can help slide easily without breaking the cap cover feet. easy for you to install. Keep the Surface Bright and Shiny: Our basin trim overflow drain plug covers are designed with good adhesion. a classic color and good corrosion resistance. which will ensure a brighter and shinier surface. Wide Application: Our sink drain plugs are suitable for most types of sinks in the market. can be applied at home. in the hotel. at the mall. at the factory and other places. please check your overflow hole diameter is compatible with our products before purchasing.