Accomplish all of your sharpening jobs with the diamond Bench Stone Kit. Kit comes with both the 325 and 750 grit stones. These stones are the ultimate in sharpening technology. Multiple layers of micron-sized diamonds bonded in nickel to a flat metal surface. Oval-shaped surface holes quickly remove fine metal filings keep stone and blade clean. These extra-large stones measure 11-1/2" x 2-1/2" and are equipped with a built-in micro-tool sharpening pad and sturdy plastic base with non-slip rubber feet. Each also includes a protective lid. The Coarse 325 grit aggressively removes metal to restore edges on dull knives and tools. The Fine 750 grit finishes knives and tools with a razor-sharp edge.