The right size for the slats.

Cuts a perfect size and shaped hole to attach a badge clip to them.

Well, based on the diagram I saw online, it was not quite the size of the object I was expected

Works as advertized - punches the appropriate-sized hole in name badges, which I used to thread mine through a keyring and carry that way

Makes the right sized slot and easy to know where the hole will be.

Ordered this to punch ID cards for a scout event