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The blue socket is used to open beer bottles.

But what is the usage for the red one? enter image description here

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    I've always used it to get things out from between my teeth. But then again, I'm British. Jul 21, 2022 at 3:15

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According to this amazon page : https://www.amazon.com/Colorful-Mcyye-Keychain-Beverage-Practical/dp/B08RY4FFT5/

This is to help open beer cans by sliding it under the pull tab:

Pepsi can being opened with the opener

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