It’s a metal band tensioner and cutter. Usually used to secure something to a post that you have no intention of removing for the foreseeable future.
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That looks like a band-it strap puller/tightener.
I forget what the actual name is, but it can latch onto a metal strip and pull it tight around some digs to keep boxes and canisters in place, or to hold a strong back repair plate on a damaged pipe
![[Challenge-Solved] I have actually used a couple variants of this thing](https://lemmy.world/pictrs/image/a03ce16f-7d63-4a27-875d-7159b597b271.jpeg){kind=link}