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They provide a tighter grip while tightening or loosening fasteners. Wrenches can be of many types, depending on their usage and function. While most wrenches in the market can fit over only a specific fastener size, the adjustable wrench is special because it can work with multiples sizes of nuts and bolts. 4. Are adjustable wrenches better? Product must be currently advertised in print or electronic media (Including newspaper, catalogue, radio, television advertising or online) Total Tools reserve the right to terminate or amend the price guarantee policy at any time without notice. For Further Information An adjustable wrench, also called an adjustable spanner or an adjustable crescent is a tool, which can be used to loosen or tighten a nut or bolt. It has a "jaw" (the part where the nut or bolt fits), which is of adjustable size [source: Websters]. 2. What is wrong with adjustable wrenches? Total Tools reserve the right to change or withdraw free delivery at any time. Estimated Delivery Timeframes