An adjustable wrench is simply an adjustable spanner - which offers more flexibility due to the range of sizes it will adapt to. They're used to tighten and loosen varying sizes of bolts and nuts and correctly applied they're an able and useful hand tool - much like a bench vise or a pair of bolt cutters .
You can purchase auto adjustable wrenches, or buy them in sets, which offers a larger range re size capacity. Often found in the construction industry, they're also commonly used in home improvements and general DIY projects.
The five best adjustable wrenches are featured below. Each one is a highly rated tool, affordable and consistently makes the best selling list in the category.