This book shelf designed for strength and durability with three vertical compartments.Width 5.9" by height 7.5", Retractable length from 3.9" to 17.7" to meet various requirements. High Quality: Made from sturdy heavy-gauge metal with hard enamel coating. Smooth edges against scratches and chips. Non-Toxic, Heavy duty and large volume are great for holding files, magazine, cookbooks, notebooks, etc. Stable Constructed: Outstanding one-piece chain feature with silicone pad on the junction keeps the bookends book shelf more stable. Usefulness: Use it to hold up books,magazines, DVDs, games, comic books, catalogs, text books, binders, cookbooks, reference books, albums etc. Save Space: This bookends takes less space than traditional bookends. Perfect for storing books neatly.