Adjustable wrenches are some of the most versatile tools in the toolbox. Often called a spanner wrench or crescent wrench these tools are used to tighten or loosen a nut of bolt simply by tightening the expandable jaw. The variety of sizes make this great for plumbers as well as do-it-yourselfers. If you typically over twist your nuts and bolts, use a torque wrench to better control the amount of pressure applied. Sold individually or by the set these wrenches can be found in black oxide, chrome, satin or powder coat finish.