?? Hook Wrench (Spanner Wrench) Vehicle Tool R37.5 Wrench

I received this as a gift from my family several years ago, but I don't really understand its use and am selling it because I don't use it. I think it's recommended for cars, motorcycles, and DIY.

It has the following main uses and features (from image search):

Uses: Used for adjusting the preload (hardness adjustment) of motorcycle rear suspension and for tightening nuts on machinery.
Features: It works by hooking the tip of the hook onto the groove of the nut and turning it.
Types: There are adjustable types and fixed types that correspond to specific sizes.

There are signs of dirt and use.

Please only purchase if you understand that this is a used tool.
Immediate purchase is OK.

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Thank you for looking.