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The 204CBN (Cubic Boron Nitride) whetstones are particularly suitable for extremely dull blades, as these provide a high abrasion. The main difference to the similar 204D Diamond whetstones is the longer durability and therefore a longer life. CBN has a similar hardness to a diamond coating, making it the preferred abrasive for industrial grinding. This item is only available as a set of 2 and fits the Spyderco Tri-Angle Sharpmaker (204MF). Made in USA