Angle iron is made from basic materials of billets and scrap. Billet, which is a type of steel bar produced from casting iron ore or pig iron. Meanwhile, scrap is used iron which is heated at a certain hot temperature so that it can be reprinted into new iron. Angle iron has two types of forms of angle iron apart from being distinguished by the degree of angle, namely based on its shape. There is plain angle iron and there is also angle iron with holes, both of which can be relied on as a support for construction structures, but they differ in the areas of use.