GE JX42AL is a filler panel kit designed to be used with 36" or 42" installations. It includes two left and two right filler panels, ten plastic joiners, and twenty Phillips head screws. The filler panels are used to fill the gap between the side of the cabinet and the microwave oven when it is installed. This helps to create a more finished look and prevents food or other items from falling into the gap. The plastic joiners are used to attach the left and right panels together, and the Phillips head screws are used to mount the panels to the cabinet.