This part is a replacement screw for your dishwasher. It is made of metal and is approximately ¾ inch long. It is a hex-head screw and is sold individually. It is used to hold the dispenser bracket in place. This part is a genuine OEM part sourced directly from the manufacturer.
OEM stands for Original Equipment Manufacturer. Simply put, this means that the company who made your appliance is also supplying the replacement part for it.