DEWALT DW4524 4-1/2-Inch by 1/4-Inch by 7/8-Inch Concrete/Masonry Grinding Wheel N/A Imported The product is 4-1/2" x 1/4" x 7/8" Arbor, Masonry Depressed Center Wheel, For Low Angle & Vertical Grinding Easy to use The product is manufactured in United States Silicon carbide grain for long wheel life in all masonry materials High grain concentration for agressive grinding action and smoother running wheels Proprietary wheel design ensures durable long life wheels 3 full sheets of glass in every 1/4-inch wheel and 2 full sheets in every 1/8-inch wheel for added durability and safety