1. Black sandpaper sanding block, holding shape, not tired of work; two style choices, hand contact surface and sanding surface have anti-skid design, with short nails inside the sanding block, used with sandpaper, can firmly hook sandpaper, Sandpaper is not easy to fall off during work, which improves polishing efficiency and work quality. 2. The A-type sanding block is made of ABS plastic, which is lightweight, environmentally friendly and durable. The B-type sanding block has a soft rubber material on the hand contact surface, which is comfortable and non-slip. 3. Uses: used with sandpaper, it can be used to polish wood products, metals, automobiles, etc.