This part is a replacement rack adjuster for your dishwasher. It is made of black plastic and is approximately 3 1/4 inches by 3 inches. The rack adjuster allows you to adjust the height of the rack. The rack adjuster can occasionally break, and when this happens you may notice that one side of your dish rack is lower than the other. If the rack adjuster is damaged, you will not be able to properly adjust the dish rack height. This is an authentic OEM part sourced directly from the manufacturer and is sold individually.