McKay 3" Abrasive Quick Change Discs Roloc Polishing/Sanding Mandrel with a Shank Power Tools Drill Bits Attachment Includes 25 Roloc Style, 3 Inch, 120 Grit Sanding Discs. THREATED PAD BACKS SCREW TIGHTLY ONTO THE MANDREL and allow for quick and easy changes. IDEALLY CONNECTS TO OUR MCKAY ROLOC SANDING DISC HOLDER, Part Number PL82095. IDEAL FOR SURFACE PREP AND FINISH WORK, Also Quickly Removes Paint and Rust for Refinishing. ABRASIVE MATERIAL: ALUMINUM OXIDE, for use with die Grinders and Drills Power Tools MAX RPM SPEED 20,000