Regardless of the size of your desk this adjustable bookshelf will fit! Sturdy particle board construction - pieces screw and hammer together - assembly required Ideal desktop bookshelf for college dorms or home office to hold essentials and stay organized! Adjustable bookshelf can be condensed for use in small spaces, or extended for more shelving space Overall Dimensions: 20"W (extends to 40") x 9.50"D x 28"H