There's not much worse than hooking into a good size fish to loose it to a dull hook. A sharp hook is vital to any anglers success on the water, and this file helps ensure you have a sharp hook at all times.
Their two-sided hook file with dual sharpening grooves will hone both the bottom hook point as well as the flat areas for sharpening the side of the points as well. They are constructed of stainless steel and a dual diamond grit surfaces. This 4-Inch model has a fine side - 600 grit, and a medium side - 300 grit.