Heavy Duty - perfect for lined or interlined draperies, the curtains rings eyelets are of universal size which enable all typeof curtain hooks fit through. Classy and Fabulous – these rings bring immense charm to beautiful window coverings and the overall environment. Nice polished and smooth surface without burrs, eliminate snagging, tugging and pulling of the curtain. Smooth 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 easily. Hassle-Less Fitting – the hoops are easy to install; they are passed through poles or rod and are good to go Affordable Luxury – the pack of 24 pieces, curved rings with detailed finishes work great and are super budget-friendly Size - Internal diameter of ring is 40MM (please allow 1-2mm error due to hand measurement). The total length of the ring including the diameter and the eyelet is 57mm.