Every child who grew up between the 1950s and 1970s will remember this one-of-a-kind, weird device that resembled a carpentry tool. However, it turned out that this thing had another purpose.

Here, we show to you the roller skates of yesterday.

Before our familiar, attractive, and smooth models, there were strangely heavy roller skates. These roller skates included a metal base and leather straps. The person would have to wear this over the user’s shoes.

It turns out that these metal roller skates held an intriguing secret, which we will now reveal to you. Let’s have a look at the unique key that came with each set of roller skates. And what was his goal?

With this key, customers may adjust the tension or looseness of the skates. However, if consumers lose their keys, they will need to buy new skates.

Perhaps some of you recall the distinctive and fun skates and keys sold with them. If you have such remarkable roller skates, you should save them, especially if the key is still present! They will undoubtedly become significant assets in the future.