Plumbers and car mechanics alike are familiar with the monkey wrench, a heavy-duty tool with perpendicular ... to the handle and a moveable jaw that is adjustable horizontally.

We tested a range of impact wrenches—from a heavy-duty, high-torque model down to a compact, medium-duty model—and subjected them all to the same challenges to identify their strengths and ...

The biggest disadvantage is that the adjustable jaw isn’t as strong as a wrench that’s fixed in place. Heavy-duty industrial workers, for example, might opt for a fixed wrench due to its ...