Corrundum Imported PRECISE, CONSISTENT: Sharpening Guides can be set to 15° or 17° or removed to sharpen freehand. SHARPEN & HONE: Premium 1000 / 6000 Corundum Water Stone provides fast sharpening and honing to create incredibly sharp knives. WATER CONTROL BASE: Provides a stable sharpening surface, less mess to clean up and stone storage. DUAL-GRIT WATER STONE: Featuring premium 1000 grit and 6000 grit aluminum oxide sharpening surfaces, it creates incredibly keen edges effortlessly PROUD TO BE AN AMERICAN COMPANY: Work Sharp is a 4th-generation family owned company in Ashland, Oregon. For over 40 years we have been engineering industry-leading sharpening tools here in the USA.