One of the most practical reasons for the hole in a nail clipper is portability. Nail clippers are small, smooth, and easy to misplace. Many people have owned more than one simply because the previous one disappeared into a drawer or vanished during travel.
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The hole provides a secure attachment point. A simple ring, string, or hook allows the clipper to be fastened to a keychain, grooming kit, or hanging organizer. This keeps it visible and accessible when needed.