HK1 Expedition tools

Here's yet another "revolutionary wrench" concept. Slide the appropriately sized wrench end around the nut you wish to remove, open the central valve (pointing down in the image), slide the piston in the direction of the nut which allows a third jaw to securely hold onto the nut when the valve is closed. There is a non compressible fluid inside which moves the jaw. Needlessly complicated? You be the judge.

 As with so many of these things, it will work for some nuts and bolt heads in some locations, don't throw away your sockets, box ends, etc...   More here.