Update International (G-2512) 12" x 2 1/2" Aluminum Oxide Sharpening Stone Combination sharpening stone Made of aluminum oxide material This sharpening stone is finest quality stone for general sharpening of hand tools and cutlery This aluminum oxide sharpener with both a coarse and fine grit will keep knives well-maintained Measures 12-inch length by 2-1/2-inch width by 1-1/2-inch height