Dimensions: inner diameter 35 mm. Outer diameter: 42 mm/1.7 inches. Suitable for metal rod with diameter less than 1 inch. Material features: the curtain rings surface made of high-quality metal is galvanised for long-lasting rust protection. Easy to use and will not hurt your curtain. Design advantages: metal curtain rings are beautifully polished surface without burrs, you can pull the curtain freely and fluently. You can remove the curtain ring and use the clip alone. Easy to use: curtain rings light gold easy to install and disassemble, clamp the curtain with your clip, then simply slide the curtain round rings onto your rod and attach curtains. Application scenario: the metal curtain clip rings are ideal for hotels, restaurants, cafes, bars, meeting rooms, bedrooms, bathrooms, etc.