Which tool has jobs that can be adjusted to fit different size bolt and nut heads?

The adjustable wrench is specifically designed to accommodate different sizes of bolt and nut heads by allowing the user to modify the jaw opening. This feature enables a single tool to grip various sizes of fasteners, making it highly versatile and useful in automotive repair and maintenance tasks. By turning a knob or a screw, the user can expand or contract the jaws of the wrench, ensuring a snug fit on the fastener without damaging it. This adaptability sets the adjustable wrench apart from other tools, which are typically fixed in size.

In contrast, a standard wrench usually has a fixed size and is designed for a specific bolt or nut size, limiting its adaptability. Pliers, while useful for gripping and twisting, do not function specifically to fit bolt or nut heads and are not primarily designed for that purpose. Similarly, a screwdriver is intended for driving screws and does not have the capability to adjust to different sizes of bolts and nuts. Thus, the ability of the adjustable wrench to fit various fasteners makes it the ideal choice for the question posed.