Ultimate Knife Sharpener: Double-Sided Diamond Whetstone with Angle Guide & Case. Double-Sided Diamond Whetstone with Angle Guide & Case. Made with industrial monocrystalline diamonds electroplated onto a robust steel base of 0.35 inches thick. Up to 5 times faster sharpening compared to traditional oil or water stones. DUAL GRIT: Coarse 325 grit (45 micron) for […]