To process with this machine it is not necessary to beat flat the bevel edge, and it can realize at-one-time moulding. Having been heated, the material end can be rolled to have distinct fishtail veining of scalloping shape. The rolled material end becomes wider and thinner with the end thickness not more than 2mm, which being called as "fishtail" belongs to advanced process before metal pattern bending. The machine can process maximum products: 16mm×16mm square steel, φ16mm round steel, 50mm×8mm flat iron. By the machine we can roll not only coarse fishtail but also thin fishtail.