This professional whetstone set includes 2 whetstones with different grits. The 400/1000 grit is used to repair chipped edges of knives and sharpen dull knives, while the 3000/8000 grit can finely sharpen and give the blade an ultimate sharpness. The whetstones are made of professional-grade white corundum, which is corrosion-resistant, heat-resistant, high in hardness and dense in density. They can be lubricated with water, eliminating the need for expensive grinding oil. After soaking for 10 to 15 minutes, they are ready to use, and the sharpening effect will be better when adding water during the process. The matched bamboo base and silicone holder ensure a stable and safe sharpening process. Whether it's carbon steel or stainless steel knives, scissors, razors, axes, chisels, etc., it can handle them easily, keeping all kinds of cutting tools sharp for a long time.