Sanding roll from the company Smirdex. The grit of the product is K180. The higher the number of the sandpaper, the greater the density of the grains per square millimeter.

• In the lower numbers (e.g., 24, 36, 40…), there are fewer grains of larger diameter, ideal for quickly smoothing rough surfaces.
• In the higher numbers (e.g., 180, 220, 320…), there are more grains of smaller diameter, perfect for heavy sanding and a smooth finish.

The action while sanding with the sander is clearly greater than when sanding by hand.