PFERD PolifanĀ® 62034 Flap Disc, Type 27 Flat, Universal Line PSF, Outer Diameter: 4-1/2 Inch, Face Width: 9/16 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grit: 60, Max Speed: 13300 Rpm, Abrasive Type: Zirconia Alumina, Mounting: Threaded, Product / Materials Abraded: Steel And Stainless Steel (INOX)