3M Adjustable Keyboard Trays help place your keyboard and mouse at proper level to increase comfort and productivity. AKT90LE has an easy adjust arm just tilt platform, adjust and release to lock in place. Adjusts height to 2" above mounting surface and 5.5" below mounting surface. Tilt is adjusted by dialing tilt knob to desired angle. Standard all-in-one platform with wooden construction minimizes bouncing. Includes all-in-one leatherette gel wrist rest with antimicrobial product protection and Precise Mouse Pad that can be placed on right or left of keyboard.