Item Type: Depressed Center Wheel, Abrasive Wheel Type: 27, Wheel Diameter: 6", Abrasive Thickness: 1/8", Hole Size: 5/8"-11, Abrasive Material: Zirconia Alumina, Abrasive Grit : 24, Max RPM: 10,185, Series: BlueFire Fast Cut, Application: Ferrous Metals, Gray Iron/Stainless Steel, Grade: Extra Coarse, Stainless, Contaminate Free