Recommended for use in all professional kitchens. For sharpening different types of knives: for meat, fish, vegetables and fruit. Efficient and precise single-step sharpening. Abrasive material – aluminum oxide. Contralateral wheels. Simultaneously sharpen both sides of the blade at the right angle. Blade sharpening time up to 15 cm: approx. 3 seconds. Blade sharpening time up to 25 cm: approx. 5 seconds.