The outer diameter of these metal curtain rings is about The inner diameter is about 53mm / 2.3 45mm. It is recommended to store rods less than 40mm. The package contains 20 pieces 45mm metal curtain rings, which are larger than other curtain rings and suitable for larger curtain rings. Please check the product size before purchasing. It is made of thick solid stainless steel, beautifully polished, and has a burr-free surface. It is stronger than a plastic curtain ring and has a longer service life. The curtain rings large ring for curtain rod, the small ring for curtain clip, can be easily installed. Widely used for bedrooms, living rooms, bathrooms, office windows, heavy curtains or light curtains.