The width inner diameter is 2.8CM, and the height inner diameter is 4.5CM. Outer diameter 3.8CMx5.5CM It can be used on the rod with a diameter of less than 26mm, and is suitable for about 95 percent of the shower curtain rods on the market. Lightweight Material - The shower curtain hook is made of lightweight plastic material, which is smooth and easy to slide Free-Slide Design - The C-shaped design and soft material allow these shower rings to slide unobstructed for a great experience MULTIPLE PIECES - There are 36 plastic shower rings in total to satisfy most customers who have more than 1 bathroom at home. They can also be spare shower rod hooks when you need to replace your shower curtain liners with new ones. EASY TO INSTALL - The plastic shower hook is flexible enough to easily install the shower rod with just one tap. It's easier and more convenient than those traditional shower curtain hooks. DURABLE AND MULTI-PURPOSE - The plastic material lets you never worry about rusting your shower grommets. It has a longer lifespan than traditional metal hooks. These plastic curtain rings are also suitable for bathrooms, dressing rooms, fitting rooms. Packing List: 36 Shower Curtain Hooks We only sell shower curtain hooks, not other items in the picture. Due to differences in different monitors, the pictures may not reflect the actual color of the item. Due to manual measurement, please allow slight size errors.