3M Adjustable Keyboard Trays help place your keyboard and mouse at proper level to increase comfort and productivity. AKT60LE has a knob adjust arm that controls both height and tilt - just loosen knob, set height and re-tighten. Adjusts height to 1" above mounting surface and 4.5" below mounting surface. 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.