Oh, those come with like every single thing from Ikea that you have to put together. Lol.
It looks kinda big for that small screw though..I dunno...
My bed is from Ikea and it has these screw-bolt thingies that have the 6-side shape alan wrench head so I have one alan wrench of right size taped underside of the bed in case I have to unbuild the bed and can't find my collection of alan wrenches.
The wheels of in-line skates have same size alan wrench screws in their axles than Ikea furnitures
I learned new word of english today, or more like new name for a thing; "alan wrench" xD
In my language those are called kuusiokulma-avain
("6-corner tool" or "6-corner key")
Sorry to hear that your Mothra got damage in repair operation. Tamas are really difficult to fix cause they are so small and have so sensitive electronics inside.