Air-powered nibblers punch a series of small holes to cut flat, corrugated, or uneven sheet metal. They start cuts in the center or at the edges of material. Also known as nibbling cutters, they leave shavings and rough edges but cut tighter curves and more precise corners than shears. They are commonly used to make holes in ducts, cut ribbed roofing and siding, and remove damaged sections of material in mechanical, HVAC, ironworking, metalworking, and automotive applications. Air-powered nibblers run on compressed air and contain few moving parts, so they typically run cool, have a long lifespan, and weigh less than corded or cordless models.