Innovative, centerline-position design of the DH640 In-Line Document Holder helps reduce head, neck and eye movement. DH640 features versatile angle and height adjustment for easy viewing. 18" wide clear backplate keeps monitor in full view. DH640 holds books, catalogs, and landscape documents. Elastic Line Guide expands to hold thick documents and catalogs firms in place. Weighted base safely supports large documents and books. Non-slide grooved shelf with raised edge keeps large, oversized documents secure