Single oil stone/whetstone made of aluminum oxide material. rough and fine faces. Ideal for sharpening knives, hatchets and small hand tools. Measures 200mm 8" x 50mm 2" x 25mm 1" . Quick/Easy and Effortless Grinding Extremely durable. Suitable for all grinding needs including grinding knives, hatchets and hand tools with a sharp edge Blade or blade that needs sharpening aluminum oxide material for strength and durability