I-beams, also known as H-Beams have and I or H cross section. The horizontal elements of the I are flanges while the vertical element is the web. I-Beams are commonly made of structural steel but can be formed out of aluminum. I-beams are most widely used in construction and can have an application for use in both beams as well as columns. Infra-Metals offers many different sizes, lengths and specifications for I -beams.