Features: 3.50" three-sided sharpening rod. 600 grit sharpening power. Black plastic casing with clip. Tip-down carry. Description: You love your knife too much to sharpen your blade on a stone when you're out in the woods. Treat your faithful sidekick better than that. The Lansky Retractable Diamond Pen measures in at only five inches when you have it tucked away in a pocket or in your backpack, and extends to eight and a half when out and ready to get your knife up to scratch. The three-sided construction makes even sharpening serrations easier. From fixed blades to fish hooks to pocket knives, Lansky's got you covered. Check out more sharpening systems at Blade HQ!