Tilting Keyboard Tray keeps your keyboard at an ergonomically correct height. Tray tilts to a comfortable angle with three settings: negative 15 degrees 0 degrees or positive 15 degrees. Quality rail mechanism provides smooth sliding from under your desk. Lock tray into place at your selected position or let it slide freely. Easily mount tray to any worksurface. Sturdy metal clamps fit desks or tables up to 1-5/8" thick.