A metal shear is a machine tool used to cut sheet metal and other materials into desired shapes and sizes. It operates by applying a shearing force, which separates the material along a straight line. Metal shears can be manual or powered, and they are commonly used in manufacturing and fabrication processes. These machines come in various types, including guillotine shears and rotary shears, each designed for specific cutting tasks. Metal shears are essential in industries such as automotive, construction, and metalworking, where precision and efficiency in cutting are crucial for production.