What you will get: 4 kitchen sink overflow rings and 4 double layer overflow covers. Outer diameter is 30mm/1.18inch and inner diameter is 20mm/0.79inch, is designed to fit standard overflow holes from 20mm to 23mm (7/8" ). Premium Material: The Round Bathroom Sink Overflow Covers are made of ABS plastic, with good quality chrome finish Plating layer with good fine adhesion, uniform color, excellent corrosion resistance. corrosion, ensures the surface stays shiny. Easy to Use: Measure your round overflow ring covers before ordering, easy and convenient to match your hole.Sink overflow ring cover designed to be simply gently pushed into the hole and snaps into place.No tools required, give you a new look for your bathroom. Wide Application: The sink drain plugs fit most of the kinds of sink in the market.Suitable for shopping malls, homes or other places to use.