Sait® 20073 Grinding Wheel, Type 27, Outside Diameter: 5 Inch, Thickness: 1/4 Inch, Arbor Hole / Thread Size: 7/8 Inch A.H., Grade: R, Grit: 24 (Coarse), Abrasive Type: Aluminum Oxide, Max Speed: 12200 Rpm, Mounting: Arbor, Product / Materials Abraded: Metal