PFERD 61105 Grinding Wheel, Type 27 Depressed Center, Reinforced, Performance Line SG-ELASTIC, Outside Diameter: 4-1/2 Inch, Thickness: 1/4 Inch, Arbor Hole / Thread Size: 7/8 Inch A.H., Grade: N (Soft), Grit: 30, Abrasive Type: Premium Aluminum Oxide, Max Speed: 13300 Rpm, Mounting: Arbor, Product / Materials Abraded: Stainless Steel (INOX)