This is a fast hard Waterstone that leaves a silky edge. Not many 4000 grit stones will raise a burr but this one does, it’s a race car of a stone. With this stone, you start striking the sharp potential of your Japanese knife and make your European knives smooooth. Always flatten your stone with a truing stone after honing. When to use this stone Fine polishing stone probably needs a progression from a medium stone or a somewhat sharp edge to start. Excellent for daily/weekly touch-ups for all-purpose knives. A shop standard. Perfect for anyone getting into the sharpening, a quality stone that won't break the bank. About Knifewear - Knifewear is Canada's largest retailer of Japanese knives and sharpening supplies. The Knifewear range of stones provides incredible quality and performance at a very reasonable price. Whether you're sharpening knives or razors, Knifewear stones will live up to their reputation.