Best Diamond Whetstones Buying Guide 2026
If you’re serious about sharpening high-performance “super steels” like CPM-S35VN, M390, Elmax, or ZDP-189, you already know that traditional water stones or ceramic sharpeners often fall short. These advanced tool steels are engineered for extreme edge retention, corrosion resistance, and toughness—but that also means they’re incredibly hard to sharpen without the right tools. Enter diamond … Read more