Inner dia. approx: 30 mm /1.2 inchOuter dia. approx: 37 mm /1.5 inchColor: Coppe r, Brass, White, Black, SilverPacakge Included: 6/12/24/36/48/60/72/84/96* Curtain RingsMaterial: MetalRings To fit up to 25 TO 28 mm Curtain Rods.Incorporates small ring to attach curtain hook Strong metal, suitable for most weighted curtains.Nice polished and smooth surface without burrs, eliminate snagging, tugging and pulling of the curtainSmooth Gliding Curtains with these Rings, Curtain rings go through the curtain rod, and curtain hooks into the small ring, then you can try to sliding the curtain easilyCurtain rings to hold curtains and draperies, curtain rings wide applied for most kinds of curtains, such as shower curtain, window curtain, french window curtain and so on.Easy to use.