"I didn't throw away the allen wrench ,,," Topic

… that came with the assemble yourself furniture because I might need one that size again.

But the kits always come with one.

Not all of them all the time.

Well, you already have fourteen of that exact same size one from other kits, so …

Wrong! I have fifteen now!

That's right. Never know when you'll need that exact tool again.

Jim

Some people just don't understand.

You can actually buy a set of Allen wrenches. You can put it in your toolbox, and you'll always have the right size. They cost next to nothing.

On the other hand, I have two such sets and still save every Allen wrench in the box of spare parts in the garage. There's a lot more than fifteen in that box…

And then there are the double ended ones you can turn like a crank

Not to forget that you can grind the ends down to make custom right angle tools if you have spares.

Just tossed 4 that came with a desk. I have hex bits for my drill.

I read the title as "Alien Wrench", I was vastly disappointed with the content…

Ah yes, but do you have the left-handed one as well as the right-handed one?

My metric and imperial Allen wrench sets came in plastic bags, so I can just stuff the new extra ones in. This approach has the added bonus that in the attempt to pull one out, it shoots all of them into an arc on the floor so you can easily go through them to find the one you want.