Tuff Stuff, 4CMAS, 4" X 1/8" X 5/8" Arbor Masonry Cutting Wheel Depressed Center, Double Reinforced With Industrial Grit & Glue For Increased Life & Durability, Superior Friability Allows Wheel To Break Down Quickly, Consistently Exposing New Grain For Increased Sharpness & Longer Life, For Low Angle & Vertical Grinding, Max RPM Rating 13,500, Cuts brick, concrete block, slate, tile and other masonry products.