Locking extensions. Wouldn't be without mine for that exact reason.
Tbh i just use normal extensions as rarely work in an environment that requires it but
The pin and 0 ring is a 100% garuntee whereas locking ones can drop them in the right circumstances plus the extensin isnt locked on to the tool end
But i think to be using the pin and oring all the time you would either have to be in aero engineering or similar
Or be using one size all the time
I do use them on the inch drive pneumatic gun just cos i get fed up of retrieving the socket constantly as it roles across the yard as there is no friction ring