ceramic sharpener SP-001 this new tooling is excellent for re-sharpening or honing the cutting edge of your metal-based knives, scissors, and cutting tools. T he super smooth surface not only grind the edge with remove the metal from the blade, butalso slightly "pushes" the metal into shape. This process either restores the sharpness of the blade after a period of use or creates the original sharp edge. Compare to metal sharper, the ceramic sharper has much better performance.