To this day, there are still people who do not know the use of this small hole

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🕳️ To This Day, There Are Still People Who Do Not Know the Use of This Small Hole

Have you ever noticed that tiny hole on the side of certain everyday objects — and wondered what it’s for?

Whether it’s on a ballpoint pen cap, a padlock, or even the air fryer basket, that small, often overlooked hole serves a purpose — and in some cases, it could even save a life.

Let’s break down some of the most common examples and finally solve the mystery behind “the small hole” that so many people still don’t fully understand.

🖊️ 1. The Hole in a Pen Cap — A Life-Saving Feature

Many pen caps, especially from popular brands like BIC, have a tiny hole at the top. While some might assume it’s for pressure regulation or to keep ink from drying, the real reason is far more important.

✅ Purpose:
The hole is designed to prevent suffocation. If a child (or even an adult) accidentally swallows the cap, the hole allows air to pass through, reducing the risk of choking.

💡 Fun Fact:
This design became standard after safety guidelines from international organizations like the ISO recommended it for writing instruments.

🔒 2. The Hole at the Bottom of a Padlock — Rust Prevention and Maintenance

If you take a close look at a standard padlock, you might see a small hole at the bottom. It’s not a flaw or manufacturing defect.

✅ Purpose:
This hole allows water to drain out of the lock if it’s used outdoors, preventing rust and internal freezing in cold weather. In addition, it can be used to apply lubricant to keep the mechanism functioning smoothly.

🛠️ Pro Tip:
If your padlock starts to stick, add a few drops of oil through this hole and work the key a few times.

🍳 3. The Hole in Air Fryer Baskets — Better Cooking Circulation

While not as mysterious, some users overlook the reason behind the perforations or small holes in air fryer baskets.

✅ Purpose:
These holes allow hot air to circulate around the food, creating a convection effect that cooks evenly and makes food crispy without oil.