Power 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. Their punches and dies can be replaced when they become worn or damaged. Corded nibblers allow long run times for repetitive tasks, maintain full power during operation, and have no batteries to recharge. Cordless nibblers operate in areas without access to wired power and run on brand-specific batteries, which fit different tools from the same manufacturer.