Sait® 26020 Cup Stone, Type 11, Diameter: 6 Inch Face, 4-3/4 Inch Back, Length: 2 Inch, Grit: 16 (Coarse), Abrasive Type: Aluminum Oxide, Max Speed: 6050 Rpm, Bore / Shank Diameter: 5/8-11, Shape/Form: Cup, Mounting: Threaded, Product / Materials Abraded: Ferrous Metals