1. Including 16 pcs of sanding block of different shaped and sizes. 2. Appropriate sanding block makes the grinding more labor-saving and more efficient. 3. The block is used with self-adhesive backing sandpaper rolls for more exquisite workmanship. 4. The block set chassis has a variety of shapes, which are common chamfers, inner and outer arcs, grooves, and flat polished chassis. 5. The sanding block is used to polish irregular planes such as concave and convex grooves, curved surfaces, planes, step surfaces, and inner holes. It can be used for polishing and polishing of woodwork, automobile, metal, paint surface, etc.