Superior Pads and Abrasives BP70 7" Angle Grinder Backing Pad for Resin Fiber Disc with 5/8&rdquo;-11 Locking Nut Durable polypropylene pad 5/8 inch-11 Metal Zinc-alloy Locking Nut included 8600 RPM Maximum Specifications: Diameter: 7" | Type: Backing Pad | Locking Nut: 5/8"-11 Max | RPM: 8000