This is the door closer plate or closure cam for your refrigerator. If your refrigerator door is hard to open or close, does not seal well, or there is a popping sound when opening the door, you will need to replace the door closer plate. You can find the closer plate at the bottom of the door, and you will need to remove the door to replace it. With the door off, simply unscrew the retaining screw for the old closer plate, remove the plate itself and then re-tighten the retaining screw. Re-install the door and your repair is complete.