Sanding roll from the company Smirdex. The sanding grains (grit) contained per square millimeter in the product amount to K180.

The larger the number of the sandpaper, the higher the density of grains per square millimeter. Thus, in lower numbers (e.g., 24, 36, 40…), we have fewer grains but with a larger diameter, making them ideal for quickly smoothing rough surfaces, while in higher numbers (e.g., 180, 220, 320…), we have more grains with a smaller diameter, suitable for intensive sanding and smooth finishing.

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