You’re describing a potato cutter, a handy kitchen utensil specifically designed to cut raw potatoes into uniform shapes for French fries. By placing it on top of the potato and pressing downward, it cuts through the potato, creating square lengths of fries, ensuring consistency in size and shape.

You are describing a French fry cutter. This kitchen utensil is designed to cut uniform shapes for French fries from raw potatoes. By placing it on the surface of the potato and pressing forward, it cuts automatically through the potato, separating it into square lengths of fries with the help of a powerful arm, ensuring consistency in size and shape.