Ridgeyard 7-Inch Whetstone, 3000/8000 Grit Combination Corundum Double Knife Two-sided Sharpening Stone A great gift for any cooking enthusiast, hand-maker, knife collector or butcher. Made of natural high grade corundum stone, our whetstone sharpener is built to last. Double-sided sharpening design,3000 grit is for rough grinding and 8000 grit is for fine finishing. Easy to use, just soak the stone in the water for 5-10 minutes, and then put it on a steady platform to sharpen your tools. Widely used in a variety of knives and tools, such as kitchen knives, outdoor hunting knife, pocket knife , hand hay cutter,chisel,sword, razor and even a axe!