Gator Grit 25 Count 9" x 11" 100 Grit Medium General Purpose Sandpaper. The 100 grit medium sandpaper is a multi-purpose sandpaper allowing you to complete all your sanding needs on wood, metal, drywall, fiberglass, or painted surfaces. The multi-purpose sandpaper can be used on both hand and machine sanders. If using an orbital sander, the sandpaper can be cut into a 1/2 sheet, 1/3 sheet, or 1/4 sheet to fit the sander.