Authentic Japanese "KING" Brand Whetstone which has the combination of the finest medium grey #1000 Grit and #250 Grit. Made in JapanIt can be used for most type of knife such as cleaver, fruit, and sushi knife. This type of whetstone is recommended by many professional chefs to achieve ultimate sharpness of the knife. Use this whetstone also to remove rust and keep your samurai sword razor sharp.