3M Adjustable 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 1.5 " 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 Optical Mouse Pad that can be placed on right or left of keyboard. Lifetime warranty on arm, five years on platform, and one year on gel wrist rests. Contains 70% preconsumer recycled content