120 grit 3M Radial Bristle disks are embedded with a long-lasting abrasive material which eliminates the need for messy compounds. Flexible and cool-running bristles are great for hard-to-reach areas or flat surfaces. 120-grit radial bristle disks are perfect for light cleaning and oxide removal. 3M radial bristle disks clean and remove dirt, rust and oxidation without damaging the underlying surface. Use on platinum, gold, silver, pewter, aluminum, steel and stainless steel. These 3" disks have a 3/8" arbor hole, and are available in six different grits. Perfect for use with the desktop polisher, use single-ply bristle disks to customize the thickness of your disk by stacking the exact number of plys you need. Use 2-3 disks for small grooves and recessed areas and 6-12 disks for wider areas. NOTE: Always place disks on the mandrel so that the bristles curve opposite (or away) from the direction of rotation -- bristles should not be bent backward during use. These unique disks from 3M are a new type of abrasive that is superior to sandpaper, flap wheels, or other types of sanders, brushes, or abrasive wheels. Their flexible bristles can reach into areas with detail and irregular, curved, or flat surfaces. Coarser grits can be used to carve, grind and texture while finer grits will smooth, burnish and polish. The 3M Cubitron and aluminum oxide grains embedded throughout the plastic bristles make them very long lasting. Individual disks are stacked to make a brush. Depending on the application, you will want to stack between three and six disks. Be sure to closely follow the directions in the package so that the disks are stacked and mounted properly onto a handpiece or the bench lathe. Use with Spindle Adapter. 20,000 RPM Max Speed. Recommended operating speed when used on the lathe is 5,000 – 7,000 RPM. WARNING: This product can expose you to chemicals including titanium dioxide, which is known to the State of California to cause cancer (www.P65warnings.ca.gov).