Excellent Knife Sharpener: Our retractable diamond sharpening stone works very well for sharpening repair knives, serrated blades and scissors, large kitchen knives and smaller kitchen knives. There are some grooves on the semi-circular surface, which can be used to sharpen fish hooks, needles, etc. etc. so that the edge of the blade becomes sharp. Small and Portable: The pocket knife sharpener can be flipped and retracted. It can then be adjusted to different lengths, shaped like a pen and fitted with a shirt pocket clip for easy storage. Very suitable for camping, outdoor adventure hunting and fishing. Sturdy Material: The diamond knife sharpener is made of iron-coated emery, which has excellent wear resistance, corrosion resistance, high temperature resistance, high strength and impact resistance. The grinding layer is fine and smooth, which can polish the knife well and prolong the life of the knife. Easy Grip: The Retractable Knife Sharpening Stone Portable Pocket Knife Sharpener is made of waterproof aluminum oxide, which is comfortable to grip and ergonomically designed is. When sharpening the tool, you will not feel fatigue or the sharpening point will slip off easily. Sufficient quantity: One package contains two sets of diamond grinding point sharpening stone. Each set includes a pen case and a sharpening rod. You can leave one set at home to sharpen the kitchen knives and the other set can be taken anytime for easy use.