3Madjustable 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 4 in above mounting surface and 6 in 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 optical mouse pad that can be placed on right or left of keyboard. Contains 70% pre-consumer recycled content.