Depressed Center Wheel, Type 27, Contaminant Free Grinding, Diameter 4.5 In., Thickness 1/4 In., Arbor Size 7/8 In., Abrasive Material Zirconium Aluminum Oxide, 24 Grit, Very Coarse Grade, Max. RPM 13, 580, Series Blue Fire Fast Cut/INOX, For Stainless Steel, Carbon Steel, Alloys To Gray Iron