Quality material: the surface of the sharpener is made of diamond material, safe and durable, not easy to crater and flatten; with fine abrasion and corrosion resistance, it can be applied with confidence and easy to maintain. Proper size: the size of the diamond sharpening stone is about 15 cm in length, 2 cm in width and 1 mm in diamond thickness; with the right size and light weight, it is convenient to carry and store. Various applications: the diamond sharpening stone can be applied to sharpening household kitchen knives, sharpening wood chisels, jade, seals, joint cutting tools and chamfering glass tiles. What you will receive: the package comes with 6 pieces sharpening stones in different styles, including 220 grit, 400 grit, 600 grit; Sufficient quantity and various styles can meet your needs. Coarse grinding and fine grinding are combined, coarse grinding is done for polishing at first Maintenance recommendations: After sharpening, remember to wash the knife before cutting;