Keep knives as sharp as the day they were bought with the 8" Dia-Sharp Whet Stone - Continuous Diamond - Extra-Extra-Fine. A knife sharpener is a tool every chef must have.Achieve the ultimate sharp edge with the Continuous Diamond Whetstone! With an Extra-Extra Fine (3 micron / 8000 mesh) sharpening surface, this professional knife sharpener offers a simple and easy solution to assuring the finest performance from all tools and knives in all applications. Unlike other messy, fragile whetstones, the precision-engineered surface of this diamond knife sharpener will stay flat throughout all your sharpening requirements without hollowing, chipping or cracking. Diamond grade clearly marked on side of stone. Sharpening with this hand knife sharpener is fast and easy. No messy oils are needed - simply sharpen with soapy water. Durable construction will provide years of consistent performance and reliable service. Made in the USA.