That small round hole on a nail clipper is usually there for one practical reason: attachment and storage.
Most commonly, it serves as a keyring or lanyard hole, so you can:
- Attach the clipper to a keychain
- Hang it on a hook in a bathroom or grooming kit
- Carry it more easily without losing it
On some designs, especially multi-tool nail clippers, that hole can also be used to attach:
- A small cleaning pick or file accessory
- A chain or case loop
In short, it’s not part of the cutting mechanism—it’s just for convenience and portability.
If you’ve seen a slightly different “hole” on certain clippers (like near the lever), that’s a separate feature used for the pivot mechanism or leverage system—so tell me if that’s what you meant and I can break that down too.