To this day, there are still people who do not know the use of this small hole | July 18, 2025

Currently, the market offers various types of locks with different designs, used for locking gates, doors, cabinets, etc., to protect property. One thing you might notice when observing closely is that locks often have 1-2 small holes next to the keyhole.

The reason for this is that locks are usually installed outdoors, such as in yards or gates, where they are exposed to rain, sunlight, wind, and water. Although they are often made of non-rusting materials like brass or stainless steel, prolonged exposure to environmental elements like rain and sunlight can cause oxidation and rust. Rainwater and moisture from dew or humidity can also lead to rust, making the lock stiff and difficult to open.

Thus, without a way to drain water, locks may become jammed, leading to difficulty in opening them, and in some cases, lock-breaking techniques may be required. To solve this issue, manufacturers have designed these small holes next to the keyhole to minimize water retention inside the lock and prevent rusting. While many users may not recognize the function of these holes, they are actually quite helpful for draining water from the lock.
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