Adjustable wrenches

Adjustable

— open-end wrenches (see relevant paragraph) with sliding jaws, the distance between which can be changed using a worm gear. This allows you to customize the size for a specific fastener and use the same wrench with parts of different sizes. Such tools are popular, in particular for plumbing work, but they can be useful for almost any task for which open-end wrenches are generally used.