Metal desk system designed especially for facilities. Glare-free, polypropylene sleeves with rugged frames for heavy use. Letter-size inserts easily slide into sleeves. Two viewing angles to choose from – 30 degrees or 60 degrees. Includes metal desk stand, metal sleeve bracket, sleeves & snap-on tabs. Expandable up to 60 views by adding item Durable 535900, sold separately. Assorted PanelsFour each: black, blue, green, red & yellow. Includes snap-on tabs. Material(s): Metal; Sheet Capacity: 40; Number of Compartments: 20; Compartment Size: Letter.