Book Ends for ShelvesOne-piece structure and adjustable bookends, has a maxium length of 48cm / 18.89in and mininum 15cm / 5.9 in. You can freely adjust the length of the book ends according to the thickness and quantity of your books or folders. Adjustable Feature of Bookends Bookends for Shelves are Divided into three compartments, suitable for different categories of books and files' storage. These book end can stablely holds your books, as a book stopper of magazines, DVDs, encyclopedias, binders, family albums, cookbooks, reference books and more. And bookend are very convenient and easy to take out the book or put it back. Separate Design of Book Ends Adjustable bookend as a big help for organizing your desk. They are perfect book organiser for desk to keep your books and folders in order and save more space for you to do other works or place other objects. This bookend is also suitable for bookcases, bedside tables, school, library or wherever you need it. Book Ends as Great Gift This Book Ends with high-quality metal material and rivets fixed construction, durable for long term use. So book holders for shelves is a great gift for your reading enthusiast family or friends. Using Notes of Book Ends For a better use book ends, please adjust the bookends to an appropriate length according to the quantity and thickness of your books, and fill this length as much as possible. If there are very few books placed, please use other items on the both sides of the bookends to squeeze slightly to make the bookend more stable. Please read the adjustment instruction to know how to adjust the length of the bookends.