About this article. Upgrade 4 in 1 sharpener has 4 compartments, including one for scissors. 3 levels of manual sharpening with diamond, tungsten and ceramic base notches, suitable for all ceramic and stainless steel knives to give it its sharp profile after sharpening. Good QualityOur knife sharpener is made from of solid materials, and respectful of the environment to make it sustainable. Equipped with ergonomic handles in ABS plastic, non-slip, it allows to sharpen coarsely, then more finely with these different stones. Easy to useIt is light and handy, rubber is placed on the base for prevent it from moving and remains stable. Very practical, easy to use, suitable for both right and left handed users, takes up little space. High Security The ergonomic design makes sharpening much safer. Good grip which allows you to sharpen your knives while leaving your fingers safe. The sharpener is an ideal product to ensure the longevity of your knives, a great ally. Service 100% satisfactory service. We guarantee you will really like our 4 in 1 sharpener. However, if you are not 100% satisfied, we will give you an instant refund. We have 12 month replacement warranty, just email us and we will get back to you within 24 hours.