RUKO 325 Grit Diamond Stone Knife Sharpener with Nylon Sheath (3-Inch) Diamond Grit Pocket Sharpening Stone with Fish Hook Groove, 3-Inch x 1-Inch 325 Grit Diamond Dust quickly sharpens Knives, Tools and Fish Hooks Supplied with Nylon Sheath Weight: 4.18 oz Lifetime Warranty