That tiny hole at the end of a nail clipper is primarily designed for portability and storage.
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Keychains and Lanyards: It allows you to thread a small split ring, string, or lanyard through the clipper so it can be attached to a keychain, a travel toiletry bag, or a backpack.
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Hanging Storage: You can use it to hang the clippers on a hook inside a medicine cabinet, workshop organizer, or tackle box so they do not get lost in a drawer.
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Manufacturing and Secondary Uses: During the manufacturing process, some designs utilize that space for the pivot pin assembly. Additionally, many people repurpose the hole as an improvised loop to tether a fingernail clipper and a toenail clipper together.
