Sandpaper sticks are quick to grind, and the larger the number, the finer the mesh, the finer the grinding. It is recommended to polish from the coarse number to the fine number, otherwise the efficiency is low and the consumption is large. Features - Color: As shown. - Material: Sandpaper. - Size: 5.2 x 1 x 1/2 x 0.39 x 0.39 inch. - The smaller the mesh number, the rougher it is, and the faster the grinding efficiency; the bigger the mesh number, the finer, and the slower the grinding efficiency. - Sandpaper meterial, durable and solid. - The machine should not be turned at full speed, the recommended is 2000-5000RPM. Recommended to polish from the coarse number to the fine number. - Suitable for pneumatic, electric rotary grinders and electric grinders. It is great for abrasive tools and metal surface polishing. - Used for polishing various surfaces such as stone, jade, agate, glass, mold, electronics, glass, equipment, jewelry, metal and non-metal.