STACKS IN 2-INCH INCREMENTS to ergonomically position your monitor for maximum comfort and personal productivity CONTROL PAPER CLUTTER - The front has an opening of 9 x 1 3/8 inches for files and paper to maximize your desktop space STRONG AND STURDY - Supports up to 60 pounds; made 100% in the USA HOME OFFICE HERO - No hardware or instructions needed; Ideal for dual monitor work stations DON'T NEED THEM ALL? SHARE! Sharing is good!