The LMAB Diamond Hook File is an indispensable tool for all predator anglers. Whether it's a single hook from a rig, a lead head or a treble hook from a swimfish, every hook can be sharpened with this file. The diamond-coated blade has a longitudinal notch into which you can guide the hook point for precision sharpening. A cord is attached to the file for easy attachment to your bag or vest. The product comes in environmentally-friendly cardboard packaging.