NortonĀ® Norzon Plus 66252939184 Grinding Wheel, Type 27 Depressed Center, Outside Diameter: 7 Inch, Thickness: 1/8 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Abrasive Type: Ceramic Alumina/Zirconia Alumina, Bond Type: Resin, Max Speed: 8600 Rpm, Mounting: Threaded, Product / Materials Abraded: Metal/Stainless Steel