Ideal for any word-processing office application, this underdesk arm allows you to lift, lower and tilt your keyboard offering optimum comfort for a wide range of users. Single knob adjustment for both height and tilt settings. One-piece phenolic tray stores conveniently under worksurface when not in use; extends and retracts on smooth ball bearing slides. Accommodates both larger ergonomic keyboards and mouse equipment. Easy and flexible installation; clamps inconspicuously to front edge of 3/4" to 1-1/2" worksurface or remove clamp and attach under the surface with four screws. Combine with the WorkFit-D Sit-Stand Desk to create a complete ergonomic desktop solution.