SE SS72BK 8" Silicon Carbide Double-Sided Whetstone with Grits 120 and 240 Dimensions: 8" x 2" x 1" Material: silicon carbide Double-sided, dual grit: 120 and 240 Comes encased in a plastic storage box Great for sharpening blades, chisels, gravers, hand tools, hooks, knives, and more