Metabo® Depressed Center Wheel, Type 27 General Purpose, series: Original Grinding®, 7 in dia, 1/4 in Thickness, 5/8-11, C24N Grit, Coarse Grade, Silicon Carbide Abrasive, 8500 RPM Maximum, Resin/Resinoid Bond, Applicable Materials: Concrete, Natural and Artificial Stone, Cast Iron, Ductile Iron, Masonry Materials, Non-Ferrous Metals, Brass and BronzeThe Quality of Cutting and Grinding Wheels Depends on Several Factors - The Grain (Size, Shape and Quality) Determines How Aggressive a Wheel Is. The Right Mix of Bonding Resins, Additives and Fiberglass Reinforcement Determines The Wheel Life. Metabo® Cutting and Grinding Wheels are Designed and Manufactured in Accordance with Our Most Stringent Specifications So That They, in Combination with Our Power Tools, Achieve The Best Performance and Productivity, Saving Time and Money. Metabo® 655660000 Original Grinding® General Purpose Depressed Center Wheel with Hub, 7 in dia x 1/4 in Thick, C24N Grit