You use a paper hole punch to punch a hole in several papers. Then you put the tines through the hole, and then bend them in opposite directions fastening the papers together. Old manilla envelopes have then built into the envelope to keep the flap shut.
There were binders that had these sort of things built in that could hold a lot of paper with a long metal band.
Really useful for shimming door latches.
We called them brads
That’s just their slang name. Their full scientific name is bradley.
These are for keeping your 200 page film script together as you shove it through the crack of the rapidly rolling-up window of a hollywood producers car.
To add to what others are saying, you stick this through the corner of a stack of papers, and it then acts as a hinge so you can swivel the top half of the stack to expose a lower page, whilst still holding the whole stack together.
It’s in the same family as staples and those H-shaped string things.

That is what rich people are talking about when they refer to cuff links. They are fancy jewelry that keeps your sleeves closed after you cut a slot in them to fit your beefy hands through but don’t use elastics or wizard sleeves.
Puppet pin, for making puppets.
Those are sounding brads, to hear you scream when you can’t remove them from your urethra…
Split pins.
For splitting.
Cotter pins?









