This adjustable book end is made of thicken steel plate, heavy duty is great for holding files, magazine, cookbooks, notebooks, etc. The adjustable design is different from traditional bookends, help us save more space. One-piece chain feature with silicone pad on the junction makes the book organizer more stable, also smooth edges against scratches and chips. The book stopper can be stretched up to 18 inches, you can adjust the size according to the thickness of the books. This bookend is not only used to hold up books, but also for magazines, dvds, catalogues, text books, binders, cookbooks, reference books, albums, and more.