3M Adjustable Keyboard Trays help place your keyboard and mouse at proper level to increase comfort and productivity. AKT70LE has a lever adjust arm that ensures positive lock on platform height - just flip lever to right, adjust height and move lever back to lock in place. Tilt is adjusted with separate pull lever. Adjusts height to .5" above mounting surface and 5.5" 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 Optical Mouse Pad that can be placed on right or left of keyboard.