The die through which the aluminum billet is forced is the element that gives the desired shape. FISA imports its dies from Europe and the United States of America. Likewise, FISA counts with specialty software and CNC equipment that enables designing and even fabricating some dies. Dies can be either available for the different customers or exclusive of a single customer.

Among the services provided, free of charge by FISA, are the design and development of the dies with the consulting of the extrusion feasibility.

When designing an aluminum extrusion, it is important to consider the size, complexity and thickness of the walls of the desired shape. The circumscribed circle is the method used to determine the size of the extrusion.