For versatility you can use your Milwaukee Mini Grinder for Sanding operations as well. This lightweight polypropylene backing pad kit converts Milwaukee's 6140-6, 6148-6, 6149-6 and 6151 to a Sander. Kit includes a 4-1/2 inch backing pad, a 5/8-11 thread disc nut. Does not include sanding disc. *Order separately.