Spotted this U-shaped tool with multiple metal blades in my grandmother’s baking bin. It has a wooden handle but looks like some kind of strange knuckles.

often made of wood, sometimes polished to a smooth finish, and the blades are spaced evenly apart, usually around 0.5 to 1 inch from each other.

The metal blades, often stainless steel, are not sharp like a knife, but are sturdy and slightly curved. This curvature allows the tool to rock back and forth or side to side, making it easier to cut through ingredients. The number of blades can vary, but most commonly, there are five, providing enough strength and coverage to perform its task efficiently.