The Keystone Sanding Mop is an abrasive mop made from J-Weight flexible cloth that provides great flexibility when sanding. The Sanding Mop is perfect for sanding curves, profiles as well as intricate or irregular shaped objects. Perfect for sanding wooden stocks, Ideal for preparing metal for blueing. Removes rust and burs in seconds. The Sanding Mops can be used in drills, drill press and flexible shafts. Suggested use is 1700 to 3100 RPMs.