I'll be carrying one of these in my back pocket when I travel back east for 8 days.
Developed by Kelly Worden [ a nationally known self defense instructor ] it's one of several items I can have with me on the plane, on my person at all times when not carrying a firearm or back up knife [ BUK ] along with a small yawara stick in the other back pocket.
The Saf-T-Wrench can be used to punch creating a small force multiplier, the hand can be opened yet securely hold onto the tool and can be used as a yawara stick as well.
Brownie