AccuSharp Explorer Outdoor Survival Tool with Built-in Knife & Tool Sharpener. Its unique diamond-tapered rod is perfect for sharpening gut-hook knives and serrated edges while a central groove allows you to sharpen fishhooks and pointed objects. This multi-functional tool also features a built-in fire starter compass emergency whistle (tested at 120dB) and SOS mirror making it an indispensable companion for the outdoor adventurer. Specifications for AccuSharp Explorer Outdoor Survival Tools with Built-in Knife & Tool Sharpener: Manufacturer: AccuSharp Grit: Fine Additional Features: No Package Contents: AccuSharp Explorer Outdoor Survival Tools with Built-in Knife & Tool Sharpener AccuSharp 735C: Explorer Outdoor Survival Tool with Built-in Knife & Tool Sharpener