I’m not talking about a hex key that extends in length but one where it can collapse in on itself to increase in size.
I did some digging online but all I could find was a patent from a company called TeleHex but it kind of sounds like they came and went in the mid 2000s. They’re website doesn’t seem to exist.
I feel like it could save space in my pocket compared to a typical hex key set or a multibit.
I was hoping I could at least find a bootleg version on Ali Express.
Not sure but maybe expanding your search to include bit drivers/sockets in general could help. Might also look for telescoping ratchet.
Like a ratcheting socket with a kind of aperture function?
Nah, just one with a swappable bit holder. They do make some that kind of iris in on the nut but I’ve heard they’re not that great.