11 Ordinary Things We Never Guessed Were Really Useful

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4. Why you may need a hole and serration at the end of a tape measure

The hole is intended for the user to attach it to a nail or bolt and measure the distance.

The serrated end will help you mark the place you need if you don’t have a pencil handy.

5. Why there is a hole at the bottom of a lock

Padlocks are generally used outside, and this hole is drainage for water that gets inside the lock when it rains — otherwise the lock would become rusty. It’s also convenient to oil the lock through it.

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