The minimum bending radium on the press brake is determined by the used material and bending angle. When using air bending, the interior bending radium is about 16% of the v-shaped die opening mouth. Thus, when 1 1-inch v-shaped die is used, the interior bending radium is about 0.16 inch. This digital is only for reference, the actual minimum bending radium is determined by the used material and bending angles.