DeWalt DW8062 4-1/2-Inch Diameter by .045-Inch Thick Metal Cutting … $1.35 or 4-1/2-Inch by 1/4-Inch by 7/8-Inch Concrete/Masonry Grinding Wheel $1.61 fs S&S (@15%) @ amazon

DeWalt DW8062 4-1/2-Inch Diameter by .045-Inch Thick Metal Cutting Abrasive Wheel with 7/8-Inch Arbor [amazon.com]

Thin .045-inch wheel design for fast burr free cutting
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