This knife and scissor sharpener from Ibili keeps your knives and scissors sharp with seven functions. Thanks to the large turning knob, you can easily choose the desired sharpening. Place the sharpener on a flat surface and hold the knife with one hand. Pull the knife from heel to tip through the sharpening slot with light pressure. Repeat this 5-7 times for a sharp knife. The sharpener offers the following functions: Coarse (diamond rods) for damaged knives, Medium (tungsten carbide rods) for sharpening the blade, Fine (ceramic rods) for polishing, Serrated knives (ceramic rods) and ceramic knives (diamond rods) are sharpened in the same way as straight knives. For scissors, move the scissor blade from tip to handle. After use, clean with a damp cloth or soft brush.