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

At lower numbers (e.g., 24, 36, 40…), we have fewer grains but of larger diameter, ideal for quickly smoothing rough surfaces. At higher numbers (e.g., 180, 220, 320…), we have more grains with a smaller diameter, ideal for intensive sanding and smooth finishing.

The action of the sander during grinding is clearly greater than that of hand sanding.