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.

5. Pastry Blender vs. Knuckle Duster: Clearing Up The Confusion
At a glance, the pastry blender’s shape bears a resemblance to a knuckle duster, a hand-held weapon designed for close combat. However, their purposes, materials, and construction are vastly different.
A knuckle duster is designed to protect the user’s hand while delivering forceful blows. Conversely, a pastry blender is designed for gentle, consistent pressure to mix ingredients. The blades of a pastry blender are dull and intended to interact with food, whereas knuckle dusters have no such culinary application.
6. Common Vintage Variations You Might Find In Grandma’s Kitchen