Think about, don't you remember going skating? Yes, it is a skate key! Every pair of wheels came with a key that fits into a hexagonal loop on the top so you can adjust the fit of the skate and tighten it. I remember I would put in my key chain because otherwise I would lose it. And if you lost it, that's it, you needed a new pair of skates... Oh good times...
SHARE if you know what it was and it bring back old good memories.....