Single cut becomes rasp cutting (rough-hewn). There is file cutting on the back surface (finishing). Moreover, since the file itself is having width, it is most suitable for the work in which cutting ability is required.
With the rigidity of HV900 (HRC67), support can be given by 1 file from soft material such as plastic product, aluminium material, copper material, mold steel, stainless steel, and ceramic to rigid materials.
The roughness of the front surface and back surface is different, so if rough hewing is performed on the front surface, and if finishing is performed after turning down the tool, usability is improved.