Also, what is this?
I believe it is specifically a betel nut cracker.
Examples
I actually had a 25-year flashback to my father's Indian office colleague using one to prepare betel nut, leaf, and spices for chewing. Seemingly every minute or so.
More of a slicer than cracker, from south east Asia and have seen a fair few.
The forum always delivers!
@chez_jay started
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Also, what is this?