The WSTHOF Tri-Stone Sharpener includes three different grits for both honing and sharpening your blades. The firm, but still porous, structure of the stone continuously releases small particles during the sharpening process. This power in combination with water helps to deliver a fresh sharp edge on your knives. The three different grits of theWSTHOF Tri-Stone Sharpener areFine (J300), Medium (J1000), and Coarse (J240).