You Probably See These Things Every Day But Have No Idea Of Their Purpose
A Small Hole With A Big Role
People who live in cold, moist places will understand how difficult it is to keep things in pristine condition. Their biggest enemy would probably be rust, and companies came to address this by adding this little hole beside the key slot in padlocks.
The tiny hole acts as a drain so that water that creeps in easily drips out of the lock. In short, this helps the tool avoid rusting and continue functioning. It is also where oil is poured in for a smoother turn.
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