Sait® 20096 Grinding Wheel, Type 27, Outside Diameter: 9 Inch, Thickness: 1/4 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grade: R, Grit: 24 (Coarse), Abrasive Type: Aluminum Oxide, Max Speed: 6600 Rpm, Mounting: Threaded, Product / Materials Abraded: Metal