What is the main feature of an adjustable wrench?

The main feature of an adjustable wrench is the open-end jaw with an adjustable screw. This design allows the user to easily change the width of the jaw, accommodating various sizes of nuts and bolts without needing multiple wrenches. The adjustable feature is particularly useful in ensuring that the wrench can grip fasteners of different sizes securely, providing flexibility and convenience in various tasks.

The adjustable wrench's design incorporates a movable jaw that can be tightened or loosened by turning a knurled screw, thus providing a wide range of applications. This versatility makes it a staple tool for mechanics, plumbers, and anyone who works with a variety of fasteners.

In contrast, options like a fixed jaw width would limit the tool's functionality, as it would not be able to adapt to different sizes. A hexagonal tip typically refers to a different kind of tool, such as a socket wrench, which is not characteristic of an adjustable wrench. Slender jaws might describe a specific design feature but do not capture the essence of the adjustable wrench's key attribute, which is its adjustable jaw mechanism.