Read “Bafu” and literally meaning torn cloth, Bafu is a tool used in polishing metals such as watch cases to a high gloss. Round pieces of cloth sewn together are soaked with an abrading agent and rapidly rotated, and the metallic case is applied to the rotating Bafu to polish. For a beautiful finish, there must be no unnecessary projections or ill-defined edge lines. With uneven shapes, the convex portions are polished more than necessary; they are worn down and there may be times when the finish differs from what was intended. With this model, the difference between the edge and case, the link from the case body to the lug top and the cross-sectional shape from the upper face to the bottom face are naturally linked to maximize the effectiveness of the Bafu polishing. It is possible to adjust the area for which Bafu polishing is applied by altering the number and size of cloths sewn together. There are several types of abrading agent. These abrading agents melt when frictional heat is generated between the rapidly-rotating Bafu and the watch case, lower the temperature to prevent parts of the burnt Bafu from sticking to the surface of products, and also serve to abrade the surface with the introduction of melted particles to the polished portion.