Gator vitrified Grinding Wheels are the perfect choice of Homeowners who have a benchtop grinder in their workshop. Best for use on bench top or pedestal grinders to sharpen metal cutting tools. Fast cutting aluminum oxide designed for high speed tool, steel, and other non-ferrous metals. Adjustable telescopic reducer bushing included. Wheel Diameter: 8 In. Thickness: 1 In. Arbor Size: Adjustable - 1", 3/4", 5/8" Grit: 60 Grit Maximum Speed: 3100 rpm Applications: Metal, Steel, Aluminum Machine Use: Bench Grinder