The door shelf bin connects to your refrigerator door, and prevents items stored on the shelf from sliding out when the door is opened or closed. It is made of white plastic and is approximately 25 inches wide. If your old door shelf bin is damaged or missing, you should replace it before you attempt to store any items on the door shelf. The door shelf bin simply snaps into place on the refrigerator door, but if the locking tabs are damaged, you may need to replace the bin. This is an OEM part from the manufacturer and is sold individually.