The Wusthof Gourmet Tri Stone Sharpener has three different and precisely engineered grit surfaces for optimal sharpening and honing: Fine (3000#), Medium (1000#) and Coarse (240#) grit. The tri-stone sharpener can sharpen and hone knives with standard double edged blades and single bevel edges. A small plastic water bottle is included to help keep the sharpening stone well saturated during use. The sharpening stone and water bottle rest inside of a compact wooden base for easy storage. Can be used for all Wusthof knives, as well as most other brands.