Features: Product features: Book page holder allows you to read with one hand holding the book, which can make room for the other hand; When you need to hold a book in one hand and do other things with the other hand, such as cooking, teaching, etc., the page holder can make you more convenient. Acrylic material: Clear page spreader is made of transparent acrylic material, so the surface of the page holder is smooth and glossy; It is very textured in the light, which can improve your reading experience. Thoughtful design: The curvature of the acrylic book reading is suitable for most open books, and the hole in the middle is polished smooth, so that you can hold it with your thumb without discomfort. Pragmatic gifts: these thumb ring page holders are surprising and practical gifts for those who like reading, suitable for teachers, students, librarians, writers, bibliophiles and so on. Measurement: The large book page holder hole diameter is about 2.5 for cm/ 0.98 inches; The medium hole diameter is about 20mm/0.79 inches; The small one hole diameter is about 19mm/0.75 inch; 3 Different sizes to fit different finger sizes. Specifications: Material: Acrylic S Size: Approx. 76x32mm/2.99x1.26 inches Hole Diameter: Approx. 19mm/0.75 inches for M Size: Approx. 80x35mm/3.15x1.38 inches Hole Diameter: Approx. 20mm/0.79 inches L Size: Approx. 86x38mm/3.39x1.5 inches Hole Diameter: Approx. 25mm/0.98 inches Type: S,for M,L Color: Transparent Package Includes: 1 Piece Thumb Bookmark note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Please refer to the picture for the detailed size.