The lower the grit number, the courser the sand paper.
60 Grit - 180 Grit
This type of sandpaper belongs to the coarse sanding range and is generally used for hard, coarse and rough things such as metal, wood and walls.
240 Grit - 400 Grit
This type of sandpaper is commonly used by us for secondary sanding of coarse abrasives, and some less demanding ones can be directly sanded and shaped.
600 Grit - 1500 Grit
This type of sandpaper belongs to the fine range, for mahogany furniture, amber, linden, gold, etc.