PFERD PolifanĀ® 62222 Flap Disc, Type 29 Conical, Performance Line SG, Outer Diameter: 4-1/2 Inch, Face Width: 5/8 Inch, Arbor Hole / Thread Size: 7/8 Inch A.H., Grit: 40, Max Speed: 13300 Rpm, Abrasive Type: Zirconia Alumina, Mounting: Arbor, Product / Materials Abraded: Steel And Stainless Steel (INOX)