Grindstone is suitable for most grinding operations, such as kitchen knives, kitchen shears, pocket knife, shun chef knife, porting knives, cutting class knife grinding, precision tool, etc. Made of high-quality diamond material, really sturdy and durable to use. Small in size, portable and convenient to sharpen more effectively. 3 different diamond stones: extra-fine to polish and refine an edge, fine for a sharp edge and coarse to transform a dull edge. A great gift - perfect sharpener for at home or in the shop offering a sharpening surface to satisfy a variety of edge care needs. We strive to provide you with high quality and convenient service. You are welcome to contact us if you have any problem about our product, we will give you a satisfactory reply.