Sait® Encore 71218 Flap Disc, Type 27 Flat, Outer Diameter: 4-1/2 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grade: Medium, Grit: 60, Abrasive Type: Premium Zirconium, Mounting: Threaded, Product / Materials Abraded: Ferrous And Non-Ferrous Metals, Stainless Steel, High Tensile Steel And Titanium