Arbor Mount Sanding Disc Vacuum Hole Design No Hole Disc Dia 9-1/8 In. Grade Fine Grit 100 Abrasive Type Closed Coat Resin Bond Abrasive Material Aluminum Oxide Blend Backing Material Fiber Mounting Hole Size 7/8 In. Series Neon Backing Weight Y Color Black Max RPM 6 600 Package Quantity 10