Adjustable Bookends The adjustable bookends can be adjusted to fit the size of the desk, with excellent retractable lengths from 15cm to 50cm to suit all needs. Protective Design Corners of this shelf bookend are rounded and smooth with a heavy-duty bookend design to prevent cuts. The stable base makes this bookshelf more secure than traditional two-piece bookends. Next to it is a creative pen holder, which can be used to place office supplies, etc. High Quality BookendsThe Adjustable bookshelf book holders are made of sturdy heavy steel and fixed rivets. More use and space savingThe unique design of this book holder stably holds books, magazines, DVDs, textbooks , encyclopedias, folders, family albums, cookbooks, reference books and much more. And it is very comfortable and easy to take out or put the book back in. This bookend takes up less space than traditional bookends. Perfect for storing books neatly on a desk or shelf.