Angle iron falls under the category of structural steel. The iron or steel items often are used for repairs requiring structural strength with relatively little weight. Angle iron comes in varying lengths and sizes. The metal is bent into an L-shape with the bend extending the length of the iron. This creates flat services extending both horizontally and vertically giving the piece strength in both directions.

Sizes are commonly stated as the thicknesses of the iron by the size of each leg of the L. Angle iron pieces are available in lengths.