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A handle is a part of, or attachment to, an object that can be moved or used by hand. The design of each type of handle involves substantial ergonomic issues. A tool that can be used to loosen or tighten a nut or bolt can be an adjustable wrench, also called the adjustable clasp. It has an adjustable size "jaw" (the part where the nut or bolt fits). The adjustable bracket works by turning a screw, normally on the bottom of the head. While ordinary wrenches can be used only on a specific noodle, an adjustable wrench can be applied to a wider range of noodle sizes. Adjustable wrenches are very helpful in the work or plumbing of your car or bike."