Sand-O-Flex Resin Bond Refills, 6 1/2 in, 80 Grit, 1/4 in Arbor, 2400 rpm

Features: Abrasive strips backed by 8 cushioning brushes for good conformability | Refills are available both scored (for finer, less aggressive work) and unscored | Load quickly and easily by turning the index knob as needed, allowing you to change grit size in minutes | Fit most electric drill and bench grinders | RPM will accommodate most electric drills