Most people never think twice about the tiny hole built into the lever of nail clippers. It looks like a simple manufacturing detail, but it actually has a practical purpose. The opening provides a convenient attachment point, allowing the small grooming tool to be connected to a keychain, hook, or other holder. Since nail clippers are easy to misplace, this simple feature makes them easier to carry and organize.

The hole can also provide an additional place to grip the lever, which may help people who have limited dexterity get better leverage while cutting their nails. It can even be useful for keeping different clippers together when households use separate tools for fingernails and toenails. But the feature has an older history than many people realize. Its origins go back to an era when personal grooming tools were becoming everyday necessities—and the reason the hole survived would soon become clear.