This tool is both useful and potentially damaging at the same time. Used correctly, it's a versatile tool that can be adapted to many situations and is a great substitute for having 100 wrenches in your took kit. It can be a bad tool, though, when used in a situation which requires a more precise tool, such as when tightening an axle bolt. High stress situations that require very tight bolts (or loosening bolts that were tightened) can cause this wrench to slip. This can damage the head of the bolt, making it even harder to loosen, and can also cause your hand to hit something close by, which can be pretty painful.