Which of the following tools is a variation of pipe wrench that has a swiveling serrated jaw?

The Stillson wrench is a specialized type of pipe wrench that features a swiveling serrated jaw, making it particularly effective for gripping and turning pipes. The serrated jaw enhances the gripping capability, allowing the tool to apply a strong hold even on oily or slippery surfaces. This design helps in maintaining contact with the pipe, which is essential for both comfort and safety when applying torque.

The Stillson wrench is distinct from other tools that might have similar functions but lack this specific design feature. For example, while the pipe cutter is used for cutting pipes and the monkey wrench may resemble the Stillson wrench, it typically does not have the same serrated gripping capability. Tongue-and-groove pliers, on the other hand, have adjustable jaws but do not specifically employ a swiveling serrated design tailored for pipe work. The functionality and construction of the Stillson wrench make it the most suitable tool for gripping round objects like pipes, emphasizing its strength and versatility in plumbing and mechanical applications.