Safety pins may seem like simple household tools, but their design hides a clever detail: the tiny hole near the clasp.

Though easy to overlook, this small feature serves several practical purposes that make the safety pin more versatile and reliable.

The hole is meant to hold a thread or thin cord, allowing the pin to attach more securely to fabric.

This keeps it from slipping or rotating — especially helpful when working with smooth or delicate materials.

It ensures stability and precision, whether you’re pinning garments, fabrics, or accessories.

Beyond sewing, the hole doubles as a tool for organization and convenience. By threading several pins onto a string,

users can store and access them easily while avoiding accidental pricks. In outdoor or emergency situations,

the hole can also be used to attach the pin to a keychain, backpack, or gear, keeping it handy for quick fixes or repairs.

This thoughtful design detail demonstrates the genius of simple engineering — improving functionality without adding cost or complexity. The safety pin,

unchanged for over a century, remains a perfect example of how even the smallest details can make everyday tools smarter and more useful.