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A pneumatic sander is a tool that uses compressed air to power orbital sanding discs, drums, and belts. Air pressure is usually controlled by squeezing a trigger or pressing a button on the sander itself.

They are used in applications where a much greater force is required such as when the nut may not break loose, or a hand wrench wont do the job. The most common use for impact wrenches is to change car tyres.