Can anyone tell me what this is? I got it in a bag of stuff from kitchenware at the thrift store. Looks like a com

Onion Slicer vs. Mandoline vs. Knife

Tool Advantages Disadvantages
Onion/Veggie Slicer Simple, safe, affordable, easy to clean Usually only one slice thickness
Mandoline Adjustable thickness and versatile Higher risk of cuts; harder to clean
Chef’s Knife Full control and no gadget required Requires skill and more time

Final Thought