Keeps documents between monitor and keyboard to help reduce head, neck and eye movement. Skid-free base allows ledge to dip below the desk edge increasing desk space. Angle and height adjustable to suit your needs. Elastic line-guide enables easy data entry and stretches to help keep thick documents in place. 18" Wide Backplate300-sheet capacity. Holds: Letter Legal A4 Books Catalogs Mounting: Free Standing Materials: Plastic Sheet Capacity: 300.