B-LINEĀ® B-Flex 45A27M Grinding Wheel, Type 27 Reinforced, Outside Diameter: 4-1/2 Inch, Thickness: 1/8 Inch, Arbor Hole / Thread Size: 7/8 Inch A.H., Abrasive Type: Aluminum Oxide, Max Speed: 13000 Rpm, Mounting: Arbor, Product / Materials Abraded: Steel/Stainless Steel/Aluminum