The Cold Steel Stylus Knife Sharpener is a retractable knife sharpener in a durable ABS plastic case. It is specifically designed for sharpening serrated knifes but can also be used on plain edged knives. The sharpener has a 600-grit surface and is perfect for providing a good serviceable edge on a wide variety of blades. FeaturesPocket clip for a quick and easy deployment Great for hooks and home and garden toolsDurable ABS plastic case