Package:50 pack curtain grommets,these eyelets fit curtain rods with a diameter of 35mm/1.38" or less,Inside diameter: approx. 40mm/1.57 ". Outside diameter: approx. 70mm/2.76 " Abs curtain rings :using lightweight abs plastic,pull and slides easy on curtain rod,curtain grommets have a silent ring in the middle,they are quiet and easy to move on the curtain rod Re-open and re-use:they can snap together solidly,but can still be taken apart for adjustments,convert non-grommet curtains into grommets,when changing curtains, the removed curtain grommets can be reused Easy to install and open:made curtains without needing sewing machine,one push to install,and easy to open when you need to replace,easy to create the window treatments,they can snap together solidly,but can still be taken apart for adjustments Multiple use:these grommets fit for fabric,upgrade curtains with these grommets,they can be used for block sun curtain,for curtains in living rooms, bedrooms, etc