Mount the drawer slides that came with the kit to the keyboard tray using the screws provided and a power drill. There are two slides on the tray, one on each end. Each slide requires two 1/4-inch sheet metal screws, which are included with the kit.
Place the brackets onto the drawer slides at the desired location. This allows the keyboard tray to be mounted 1 1/2 inches to 3 inches down from the counter top. Place the brackets in the suitable position. Attach them using the 5/8-inch screws provided and a power drill.
Place the keyboard tray underneath the counter top. Center the keyboard tray from side to side. The keyboard tray should be mounted flush to the front of the counter top so that it is easily pulled from the slides.
Fasten the keyboard tray to the bottom of the counter top using a power drill and the screws provided with the kit. Place three screws in each of the four mounting brackets to ensure a tight joint.