Circular Black Sanding Paper For Steel & Marble Black 11.5cm 50pcs/pack: P120 18cm

When it comes to sanding steel or marble, it's important to use sandpaper that is specifically designed for these materials. Regular sandpaper may not be effective or may even damage the surface.

For steel, aluminum oxide sandpaper is a good choice. It's durable and can handle the tough surface of steel. For marble, silicon carbide sandpaper is recommended because it can effectively remove material without causing scratches or damage to the surface.

When using a sanding disk, it's important to choose the appropriate grit level based on the degree of roughness or smoothness required for the task. Higher grit numbers indicate a finer sandpaper, while lower grit numbers indicate a coarser sandpaper.