Whirlpool Genuine OEM W10898070 Refrigerator Lokring Pre-Assembly Tool. 5/16".
This part works with the following brands: Whirlpool, Roper, Admiral, Maytag, Hardwick, Jenn-Air, Estate, Magic Chef, Crosley, Inglis, Norge, Modern Maid, Amana, Kenmore, KitchenAid, Caloric & Ikea.
This part may also be referred to as a Lockring Assembly Tool.