Fontijne Grotnes has developed an uncommon approach to metalforming as an alternative to conventional techniques and practices for forming or sizing hollow geometric shapes. There are two key factors to this approach: the use of hollow cylindrical blanks and the subsequent forming processes to shape the blanks.

Using cylindrical blanks eliminates the costly stamping operations of blanking, deep drawing and piercing, which can lead to expensive scrap. These blanks are formed to close tolerances, often in single operation, by expanding, shrinking or rotary roll forming. These processes eliminate machining and fabricating steps, saving time, material and manpower.