The small round hole on many nail clippers is usually not a hidden button or sharpening feature. It is part of the clipper’s metal construction and can serve as an opening around the pivot/rivet mechanism that holds the cutting arms together. On some designs, the hole can also be useful for attaching or positioning the clipper on a key ring or small chain.

Nail clippers are built around a simple lever mechanism: when you squeeze the handles, the upper and lower cutting edges move together and create enough force to trim the nail. The small openings and grooves you see are often related to the way the clipper is assembled, folded, or attached to other parts. Because manufacturers use slightly different designs, the exact purpose of a particular hole can vary from one clipper to another.

So, if you’ve ever wondered why that tiny hole is there, it’s generally a practical part of the clipper’s design rather than a mysterious extra function. If you send me a photo of your specific nail clipper, I can identify exactly what that particular hole is designed for. Disclaimer: This explanation is general because nail-clippers vary by manufacturer and design. The exact function should be confirmed from the specific model or manufacturer information.