For use in hard-to-reach places. For worn screw connections that are otherwise very difficult to open. A problem solver for automotive and industrial applications. Particularly suitable for brake lines, tie rod adjustments, etc. The positive fit connection to the screw or nut is achieved through the special design of the grip wrench jaw. Positive fit connections do not suddenly come apart; instead, they must change their geometric shape to be loosened, effectively signaling their failure through a visible change in shape.