PFERD PolifanĀ® 62268 Flap Disc, Type 27 Flat, Performance Line SG, Outer Diameter: 7 Inch, Face Width: 5/8 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grit: 40, Max Speed: 8600 Rpm, Abrasive Type: Aluminum Oxide, Mounting: Threaded, Product / Materials Abraded: Steel, Stainless Steel (INOX), Plastics And Wood