The sharpener adopts 3stage sharpening system, which combines both ceramics and diamond material. This combination creates a fast, easy, and very effective sharpening system for every knife owner. Just few pulls, you will cut through a tomato like butter.Easy grabbing handle, together with skid resisting base, it would be very easy and safe for you when sharpening. 'Coarse' slot is for grinding a new edge, 'Fine' is for honing and bringing back a razor sharp edge.No need to struggle with the dull knife, just few pulls, our sharpener will bring you a sharp knife.In order to extend its lifespan, please make sure the knife to be sharpened is clean, and after sharpening, please clean the sharpener. Wipe the sharpener with a clean and dry cloth. Never wash the sharpener with water and other liquid. Do not place it in the dishwasher.