Mine are all metal, but I know there are plastic ones.
My mom used it for grating boiled eggs for egg salad sandwiches. She also had a flat hand held grater/slicer much like some of the mandolines I see. I think I have it too.
Mine was great while it lasted.LOL
In my wanderings...between planting seeds this am, I just went to Walmart. They have very helathy looking trees- mandarines, avocado, Meyer Improved lemons, and limes for $29.99. I would’ve gotten an avocado, but they were hass, and I want a Brazos, or Uvalde.