My grandmother found this object in one of her drawers and can’t remember what it is or what it’s used for.  Do you know what it is?  It was a part of our childhood nostalgia. The answer is in the first comment.   

This object is a multifunctional jar opener. It is designed to help open various types of lids and caps thanks to its different sizes of serrated rings and its lever system.

Here are its main uses:
 Opening jars: The different-sized rings allow it to adapt to various lid diameters, providing a better grip for easier unscrewing.
 Opening bottles: The upper part can be used to uncap beer bottles or other beverages.
 Tightening or loosening screw caps: It can also be used for plastic caps that are too tight.

This is a handy kitchen tool, especially for people with a weak grip! Your grandmother might have used it without even thinking about it back in the day. 

In addition to being a multifunctional jar opener, this tool can also be useful for:

 Cracking nuts or hard shells: Thanks to its serrated shape and leverage effect, it can be used as a nutcracker.
 Helping to open vacuum-sealed jars: Some models allow you to break the vacuum seal of a lid, making it easier to open without effort.
 DIY use: Although designed for the kitchen, some people also use it to unscrew small fittings or tighten circular objects.

If your grandmother had it in a drawer, it was probably one of those little handy gadgets she used without even realizing it! Maybe trying it out will bring back some memories.