Norton 614636855653 IB8 1-by-2-by-8-Inch Fine/Coarse India Combination Oilstone, Red Combination oilstone has 100 grit on one face for repairing steel cutting edges and 320 grit on the opposite face for sharpening and maintaining them Aluminum oxide produces durable, smooth-cutting edges, and is preferred for close tolerances Prefilled with oil to allow lubricant to stay on surface during sharpening 1 x 8 x 2 inch (H x W x D) size makes this stone suitable for use as a bench sharpener for knives and tools Oilstone is more durable and harder than a waterstone