Sait® 22021 Cut-Off Wheel, Type 27, Outside Diameter: 4-1/2 Inch, Thickness: 3/64 Inch, Arbor Hole / Thread Size: 7/8 Inch A.H., Grade: S, Grit: 60 (Medium), Abrasive Type: Aluminum Oxide, Max Speed: 13300 Rpm, Mounting: Arbor, Product / Materials Abraded: Metal