Check the listing for details. 7" INCH BACKUP BACKING POLISH SANDING DISC PAD FOR ELECTRIC GRINDER. Condition: New. Listed at 21.99 USD. Description:7" x 5/8"-11 Fiber Disc Backing Pad 7” Fiber Disc Backing Pads are built to extend the life of each resin fiber disc while providing a sturdy support for any application from aggressive grinding to high grit finishing. Each high strength plastic back up pad is designed with raised spiral ribs to allow air flow during use. Additionally, the fiber backing pads have holes for further cooling. Resin fiber discs can last up to 50% longer because of these cooling measures. Each fiber backing pad comes with a lock nut. Features: High Strength Rigid PlasticSpiral Raised Ribs (Cooling)Air Holes (Cooling)Cooling features can extend life of Resin Fiber Disc 30% - 50%Lock Nut Included Diameter: 7" Arbor: 5/8"-11 (with Lock Nut) Type: Resin Fiber Backing Pad Use: Angle Grinder Specification: 7" x 5/8"-11 Max RPM: 8,600 RPM Quantity: 1