Product Information Suitable for home use, the Combination Waterstone with 1000/3000 grit is a professional quality sharpening stone that is perfect for ensuring accuracy and precision for your knives. The 1000 grit on one side has a middle grade coarseness and is great for sharpening and putting a cutting edge on your knife, The opposing side is a finer 3000 grit whetstone to put a super fine edge on your knife or what is called polishing. The sturdy plastic base has non-slip feet to ensure the stone is steady and safe sharpening. This grit combo is the great for maintaining the edge on your knife and polishing a super fine edge. All whetstones need to be submerged into water for about 5 minutes before sharpening to ensure there is enough moisture to create a paste between the knife and the stone. It is also recommended to use a few drops of dish washing liquid to enhance lubrication.