People left mind-blown after finally discovering hidden use for hole in special key

Nowadays people are learning all kinds of things on social media.

Just recently, foodies discovered what one of the iconic Haribo sweets is really meant to be – and it's not a key.

And now it so happens our friends on X, formerly Twitter, are mind-blown after learning what the hole in a special key is supposed to be for.

In a post on the Today Years Old account, which boasts 1million followers, the page wrote: "How old were you when you discovered what this is for?"

Since it was shared, it garnered a massive 1.6million views with 7,500 likes and hundreds of comments. Now have you ever wondered?

In the video, it shows the special key which is often used as a tool for drilling through wood. And in order to complete a perfect circle, you need the hole to allow you to draw the shape with ease.

It's basically like a compass you use for a maths lesson, but for a DIY job. Mind-blowing right?

The clip demonstrates how it's beneficial for such situations as the person completes the job rather simply with the circle.

We don't know about you, but is there a more perfect circle you've ever seen in your life?

It seems social media users were also stunned by its hidden use after hundreds rushed to the comments section.

One wrote: "Well, it was today. So that's how old I was."

While another added: "About 15 seconds into this video." And a third admitted: "To be honest, today only learnt."

Meanwhile a fourth chimed in: "My age as of this very moment! I never knew about this." And a fifth said: "What? No way!"

They do say, every day is a school day...