Curtain Rod Rings Outer diameter is 46 mm, inner diameter is 38 mm/ 1.5 inch, fits rods up to 35 mm (13/8") in diameter. Suitable for all types of rods.Smooth Gliding & Glossy Finish Curtain rod rings feature finely polished smooth surfaces with no burrs, ensuring effortless gliding of your curtains.Eyelet Design Curtain rings have a round eyelet that keeps curtain hooks or clips in place and prevents them from falling off while keeping your drapery in good condition.Wide Application Curtain gliders and rod rings make it easy to hang most types of curtains, such as shower curtains, window curtains, French window curtains, and more.Easy Installation Attach curtain hooks to the curtain rings and slide the rings onto the curtain rod one by one. Metal drapery curtain rings work well with all extendable and nonextendable rods.