Satake Shapu knife sharpener 14.2 cm from Satake offers optimal sharpening for Japanese (15°-18°) and European (20°-23°) edges. With spring-loaded diamond and ceramic rods for shaping and maintenance, the sharpener is easy to use. Use the diamond side to restore dull edges and the ceramic rods for daily maintenance. Place the sharpener on a stable surface and follow the sharpening instructions for best results.