A process similar to the conventional extrusion process producing an extrusion with abrupt changes in dimension. In this process the extrusion press is stopped when the billet is only partially extruded, the split dies are removed and replaced with dies of larger opening or orifice. Extrusion is then resumed. The result is an extrusion which has an abrupt change in cross section. The first portion extruded having the smaller cross section is called the minor section while the second portion having the larger cross section is called the major section.