Eyotool Set of 16 Metal Curtain Rings with Clips and Eyelets, Extra Thick, Decorative Drapery Curtain Clips Rings 3cm 1-inch Interior Diameter, Fits up to 3/4 or 5/9inch Rod, Black (Set of 16) Solid steel curtain and drapery rings with clips and eyelets Stronger tension clip support heavier application Simply slide the rings onto your rod and attach drapery 1-inch inner diameter; compatible with 3/4 inch or 5/9 inch diameter rod sets Internal Diameter: 25mm, External Diameter: 30mm, Thickness: 3mm