Chef'sChoice EdgeCraft Diamond Hone Knife Shapener, Gray For sharpening all types of knives, including hunting, fishing, pocket, kitchen and household knives Sharpens both Straight edge and serrated knives to better than factory sharpness Two stage sharpening for stronger and more durable edges 100% diamond abrasive sharpening surfaces Patented flexible spring knife guides ensure precise angle control and eliminate guesswork