What kind of file do you need to turn a 15mm hole into a 40mm hole?
A pedophile.
The Right File
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Explanation
Explain Bear
Explain Bear here. It is a pun on the tool 'file' and a predator. The joke implies the tool changes the size from a child (15mm) to an adult (40mm). You probably struggle to put shoes on the right feet, don't you?