Power shears move their pivoting blade against their fixed blade to make straight or curved cuts through sheet metal. They cut more slowly than nibblers but leave smoother edges and less mess. Shears are commonly used to cut panels and ducts in mechanical, electrical, plumbing, HVAC, and automotive applications. Their blades or cutting heads can be replaced when they become worn or damaged. Corded shears allow long run times for repetitive tasks, maintain full power during operation, and have no batteries to recharge. Cordless shears operate in areas without access to wired power and run on brand-specific batteries, which fit different tools from the same manufacturer.