This keyboard drawer attaches to virtually any work surface without tools or complex instructions. Tray adjusts to three height positions below desktop: 2-3/16", 2-13/16", and 3-1/2" Tray tilt adjusts to -3, -6, or -9 degrees to suit personal preference Includes soothing memory foam wrist rest with new Microban(R) antimicrobial protection and cable management Patented clamp easily attaches unit to desktop (5/8" - 1-1/2" W) Fellowes Designer Suites DeskReady Keyboard Drawer