Introducing the 100 Grit Aluminum Oxide Grinding Wheel by POWERTEC. This 8" bench grinder wheel was designed to fit most stationary bench grinding machines for high speed steel sharpening and deburring. It features premium white aluminum oxide with a vitrified bond. As this abrasive grinds down with wear, it produces a consistent and fresh grinding surface for balanced work. Whether sharpening your metal lathe turning tools, lawnmower blades or other HSS tools - this grinding wheel stone will get the job done with high precision results. //Commonly Used Applications:Lawn mower blade sharpening tool Metal lathe tool sharpeningSharpening HSS drill bits Planer blade sharpenerChisel sharpening tool (It is not recommended that you grind wood, plastic or any other non-metallic material on a bench or pedestal grinder.) //Dimensions and Specifications: Diameter: 8", Thickness: 1", Arbor size: 5/8",. Material: White Aluminum Oxide (Alundum), Bond: Vitrified , Grit Type: 100 , Maximum RPM: 3600.//.