Serviceable and : these 5 different types of knife sharpener stones are made of quality emery abrasive, wear , not easy to rust, sturdy and , not easy to deform, and the whetstone has a faster speed than the traditional whetstone. 5 Grit types: there are 5 different types of grit 240, 320, 400, 600, and 1000, which the rough grinding can be applied to repair the severely passivated knife, and fine grinding can be applied for trimming, consolidating, so that you can choose the right whetstone to apply according to your needs. Convenient to apply: these whetstones with a non-slip base, and you do not need to add water or oil when sharpening , and portable, which are convenient to carry or apply in . Good workmanship: these angle sharpening stones are designed with a simple and generous shape, and the edges are smooth and neat, without scratching, non-slip and astringent, designed to improve overall durability and sharpening effect, improving work efficiency. Wide range of applications: these sharpening stones with non-slip base are suitable for most kitchen knives, which can be applied for grinding, scissors, chisels, plane irons and so on, and you can share with your family and friends.