Solid squares of plain steel 20х20

Iron is the most widely used metal, accounting for 95% of world metal production. * Main component of steel and cast iron - one of the most important building materials. Iron is used mainly for building structures, but also in mechanical engineering. * Its oxides are an important element in the production of data recording devices: cassettes, diskettes, hard disks. * Iron sulphates mixed with copper sulphate are used to control pests in agriculture.