Stainless Steel Knife Sharpener - For Double-Edged Blades - Ambidextrous ★Easy-to-Grip Handle Type Includes shipping. Dimensions: Approximately 20.5cm Materials: Sharpening part / Ceramic, Tungsten steel 　　　　　Base / EVA 　　　　　Body / Polypropylene, Stainless steel --------------------- ◆How to Use ● Insert the blade of the knife into the groove and pull it towards you with light force 4-5 times. (Do not sharpen back and forth) ● Use on a stable, flat surface. ● Be careful not to slip due to water or oil. ● Hold the handle firmly and do not bring your hand close to the blade of the knife. ① is for coarse sharpening (tungsten steel). ② and ③ are for fine sharpening (ceramic). ※ ② and ③ are the same fine sharpening. Use in the order of ① coarse sharpening → ②③ fine sharpening.