3Madjustable keyboard trays help place your keyboard and mouse at proper level to increase comfort and productivity. AKT65LE has a tool free installation knob adjust arm that controls both height and tilt - just loosen knob, set height and re-tighten. Adjusts height to 1-1/2 in above mounting surface and 4-1/2 in 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 optical mouse pad that can be placed on right or left of keyboard. Contains 70% pre-consumer recycled content.