2 whetstones have difference grit which are 400/1000 and 3000/8000. The grit is accurate. 4 sides grit are satisfy with any knife blade needs. 400/1000 grit is typically used to repair knives with chipped edges and sharpen dull knives. 3000/8000 grit used to refine the edge and provide extra fine finish/polish on your blades. 

• Natural sharpening stone: The knife sharpening stone set is made of professional-grade white corundum corrosion & heat resistant, giving the wet stone a longer life. The material is high hardness extremely dense and ultra-consistent sharpening. Water stone can improve the work efficiency and fast cutting that abrade quickly to reveal new sharp cutting particles. Angle guides create precision and consistency to maintain an edge making sharpening faster and easier.
• Safety Sharpening: Safety is very important to us when dealing with sharpening tools. So we provide the bamboo base and silicon holder. The bamboo base is provide a stable platform and the back of the base has a rubber support, which keeps the balance and does not move during the sharpening process. The silicon holder can fix the whetstone and hold the whetstone inside non-slip bamboo base. Use HMPLL whetstone sharpening kit to minimize risk.
• Easy To Use: Whetstone knife sharpener are lubricated with water, no expensive grinding oil needed. Before using whetstone, you need to soak the stone 10-15 minutes and they are ready to use. The sharpening stone is not to cracked. When you sharpen your knife, you can add water on it, water the lubricating effect of grinding results will be better and will help you save time and increase the sharpness of the blade.