For all the convenience that a typical adjustable wrench provides, repeatedly removing and repositioning it on a bolt can be frustrating, especailly in tight spaces. Stanley to the rescue. The NEW patented ractcheting jaw function allows you to turn the bolt and slide the wrench to the starting position - without removing it from the bolt. It's uncanny! The magic is how the lower jaw slides out of the way and then springs back to regrips the head of the bolt. This truely is revolutionary innovation in hardcore tools.