Neiko 11108A 4.5&rdquo; x 7/8-Inch Aluminum Oxide Flap Disc, 80 Grit | Flat Type #27 | 10-Pack NEIKO: 10 Pack, Max speed: 13,300rpm. 80 Grit. Arbor Size: 7/8"./ Flap type #27 Perfect for finish work, deburing, and light grinding. Great for use on rust, paint, steel, and non ferrous metal. Part # 11108A, if you receive a unit with different part #, you should consider it counterfeit and return to seller immediately.