PFERD 61111 Grinding Wheel, Type 27 Depressed Center, Reinforced, Performance Line SG-ELASTIC, Outside Diameter: 5 Inch, Thickness: 1/4 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grade: N (Soft), Grit: 30, Abrasive Type: Premium Aluminum Oxide, Max Speed: 12200 Rpm, Mounting: Threaded, Product / Materials Abraded: Stainless Steel (INOX)