Sait® 59280 Sanding Disc, Closed Coat, Diameter: 4-1/2 Inch, Grit: 80, Abrasive Type: Zirconium Grain, Backing: Vulcanized Fiber, Bond Type: Resin Over Resin, Bore / Shank Diameter: 7/8 Inch, Product / Materials Abraded: Ferrous And Non-Ferrous Metals, Stainless Steel And High Tensile Alloys