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Contact SupplierGears are a very useful simple machine. The most common situation is for a gear to mesh with another gear, but a gear can mesh with any device having compatible teeth, such as linear moving racks. A gear's most important feature is that gears of unequal sizes (diameters) can be combined to produce a mechanical advantage, so that the rotational speed and torque of the second gear are different from that of the first, In the context of a particular machine, the term " gear" also refers to one particular arrangement of gears among other arrangements ( such as "first gear"). Such arrangements are often given as a ratio, using the number of teeth or gear diameter as units.