J.Walter Flexcutâ„¢ 15-L 456 Grinding Wheel, Type 29, Flexible, Outside Diameter: 4-1/2 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grit: 60, Abrasive Type: Aluminum Oxide, Max Speed: 13300 Rpm, Mounting: Threaded, Product / Materials Abraded: Aluminum/Other Non-Ferrous Metals/Steel/Stainless Steel