Adjustable & Expandable Bookends: This adjustable bookend holder is flexible and can be re-sized according to the number of books. Outstanding retractable length from 4" to 19.6" to meet various requirements. Heavy Duty Bookends: Made of heavy-duty steel and powder coated, these bookends are scratch and chip resistant.The stable base is not easy to slide, and the quality is excellent. Perfect File Magazine Organizer: Adjustable Bookends are used to hold up magazines, books, dvds , games, catalogues, binders, family albums, and more . Steady and Strong: Steady base ensures books stay in place.Enough to hold oversized and heavy books without anything falling over. Demission: The initial size 5.7''x7.4''x3.9''.the lengest retractable size 5.7''x7.4''x19''.