Uncaged Ergonomics (RS-s) Adjustable Height and Angle Ergonomic Reading Stand Book Holder, Book holder, Tablet Stand, Document Holder. Perfect for Textbooks! Aluminum, Silver ADJUSTABLE HEIGHT: Raise reading materials to eye-level and stop slouching | Height Range: 0-21" ADJUSTABLE ANGLE: decrease page & screen glare. Eliminate eye strain. Panel locks in 15-degree increments OPEN SPACE BOTTOM: Helps de-clutter & organize desk space. Perfect place for taking notes! LIGHTWEIGHT: All aluminum | sturdy, durable, and portable | Collapses Flat| PERFECT for studying, reading textbooks, cookbooks | Slips over your lap in bed to make reading more comfortable