Only the exact wrench size can be used on a fastener, unlike screwdrivers that can turn fasteners slightly larger or smaller. That’s why sets of Allen wrenches are so popular. Using the wrong ...

You can make the jaw's opening wider or narrower by turning the worm screw, but the exact range will vary based on the overall size of the tool. Sets, such as the Workpro Adjustable Wrench Set ...