NortonĀ® Norzon Plus 66252843331 Grinding Wheel, Type 27 Depressed Center, Outside Diameter: 5 Inch, Thickness: 1/8 Inch, Arbor Hole / Thread Size: 7/8 Inch A.H., Grit: 24 (Coarse), Abrasive Type: Ceramic Alumina/Zirconia Alumina, Max Speed: 12225 Rpm, Mounting: Arbor, Product / Materials Abraded: Metal/Stainless Steel