The Victorinox 4.3391.6 medium-grit sharpening stone is an essential tool for professional kitchens seeking restaurant-grade knife maintenance. Designed to work seamlessly with the Victorinox 40997 sharpening system, this stone provides a balanced abrasive surface that refines knife edges after coarse honing. Its crysolon-grade silicon carbide composition ensures durability and consistent performance, making it a reliable choice for commercial kitchen staff who demand precision in their sharpening process. The rectangular profile and medium-grit surface deliver steady, even strokes, allowing for superior edge definition without excessive material removal. Whether you're maintaining a fleet of knives or ensuring daily sharpness in a busy restaurant, this Victorinox sharpening stone is built to meet the demands of professional culinary environments. Its industrial muted gray finish adds a touch of professionalism to any kitchen workstation.