J.Walter Stainless™ Combo 08-F 452 Grinding Wheel, Type 27 Depressed Center, Combination, Outside Diameter: 4-1/2 Inch, Thickness: 1/8 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grit: 30, Abrasive Type: Aluminum Oxide, Max Speed: 13300 Rpm, Mounting: Quick And Easy Spin-On, Product / Materials Abraded: Stainless Steel