Since sheet metals come into the trades in flat sheets, shears for cutting these sheets have been devised. There are two kinds of shears, namely, a power shear for cutting out edge lines, and a machine shear for cutting out circles and perforating holes.

Sheet-metal tools usually are more difficult to make than other grades of tools, because those parts which stand out or project must be hardened. The part of the tool that does not require hardness is usually made of iron, while the working parts, which must be firm and hard, are made of composite steel.