Encased in a smooth, hard plastic cover the Bear Grylls Knife Sharpener fits easily in your pocket. The handle is made of grippy rubber for secure holding in wet or cold conditions. Two rod shaped diamond-coated sharpeners allow you to sharpen the serrated sections of your knife. Coarse Carbide and Fine Ceramic inserts will get your fine edge blade in shape. Your Survival Series Field Sharpener will likely be the only one you'll ever need.