The US Army Rangers requested a small, easy-to-use, go anywhere knife sharpener and Redi-Edge engineers delivered. The field-proven, tactical-tough Redi-Edge Tactical Pro is found on military installations around the world. Produced from military-grade aluminum for extreme durability, long life, and lightweight. Design features include a proprietary corrosion-resistant finish, an ergonomic thumb pocket that creates excellent grip-ability even when wet, a honing surface on the back, and a v-groove for fish hooks and needle points. The Duromite sharpening elements are harder than any knife blade and factory pre-set to sharpen filet or boning knife blades at a 30 degrees inclusive angle to maintain a 15 degree double cutting edge.