The Benchmade 985547F Field Knife Sharpener Serrations (Comboedge). This sharpener, by Redi-Edge®, is small enough to sit unnoticed tethered around your neck or in a pocket. It has a 60-degree inclusive angle (often referred to as a 30 degree angle) that will easily touch up the edge of your blade anywhere, anytime without removing unnecessary blade material. This version includes a diamond honing rod for easy touch-ups and serrations. Includes nylon sheath for easy carry. Honing rod unscrews and fits inside sharpener.