Enough to use: the package comes with 2 fixed grinding angle tools in black, enough quantity to meet your applications and replacements when you learn the grinding movement Simple but practical: the guide of sharpening adopts classic black, easy to match with most styles of sharpeners, and can help you easily sharpen at the right angel, giving you a safe using experience Ensure safety and improve efficiency: l The fixed knife sharpener has a humanized design which can let you maintain a certain angel and reliable to apply force when you sand Quality in use: the sanding aid kit is made of solid plastic and ceramic , sturdy and reliable, portable and smooth, not easy to deform or break, allowing you to use it for a long time Applicable places: these constant grinding angle guides can be applied to firmly fix the e knife and hold it at a certain angle, suitable for most knives, such as fruit cutters, kitchen knives, industrial knives and more, suitable for home, office, restaurant, market, shop