What the hex!

Here is a very deep dive into the venerable Hex or Allen Key.

Be warned, this is proper nerdery, and yet is surprisingly readable (or I find it so at any rate!).

Why are they called Allen Keys?
“Allen wrench (part of the original Allen Manufacturing Company) is a registered brand trademark” – well now you know!

https://buff.ly/3Lfj8G5

#tooltuesdays