EUROTOOL ABR-515.03 25pc 1 1/2 X 1/2 inch COARSE 60 Grit Cartridge Rolls. Cartridge sanding rolls are rolled up sandpaper with a hole in the middle. As the sandpaper gets used, there is more below. Use with 1/8 inch cartridge sanding roll mandrel, not included. For use with Dremel Rotary Tools.