This hex nut is an authentic Whirlpool part that is sourced directly from the original equipment manufacturer, and will fit a variety of appliances including ovens, microwaves, refrigerators, air conditioners, and dishwashers. It is a metal part with a threaded hole to fasten parts in the appliance together. It is common for this part to wear out; it is recommended to order a spare. To replace this part the tools needed are a nut driver or wrench. This nut features a built-in external tooth lock washer, which is used to help keep the nut in place.