Knife Sharpening Tools The Tungsten Carbide Blades Shape Even The Dullest Of Knives Into A Double Edge Finish. Watch As Your Previously Useless Knives Come Back To Better-Than-New Quality. Sharpen, Hone And Polish Your Dullest Knives In Minutes With This Advanced 3-Stage Sharpener. First Two Stages Sharpen And Hone Using 100% Diamond-Coated Abrasive Disks. Final Stage Uses Flexible Stropping Disks For A Finished Polish.