Whether you call it a Saltus Wrench or a flex combination wrench, it still looks like you left your sockets alone in the dark with your wrenches for too long. I remember running into one of these wrenches in my dad’s toolbox as a kid and thinking, “What the hell is this for?” Given the proliferation of ratcheting box end wrenches and other innovations, most people probably don’t run into these wrenches anymore.
The open end and the socket on one of these wrenches are the same size, and the socket isn’t removable. The socket usually rotates on the end of the wrench, somewhat like a socket on the head of a breaker bar — this setup might get you into some areas too tight for a ratchet and socket.
I found three manufacturers that still make these wrenches: SK, Matco, and Armstrong, although there are probably more out there if you search hard enough. A single wrench will run you anywhere from $15 to $40, while a set can run anywhere from $100 to $400.