High quality sharpener to keep your knives sharp longer. The knife sharpener is made of tungsten carbide specially designed to sharpen and maintain knives over time. Diamond surface head: for sharpening very worn, blunt knives. Tungsten carbide steel head: for perfect sharpening. Ceramic head: for polishing and bringing a complete finish to the sharpening. An expert cutler since 1839, Richardson Sheffield has forged an unparalleled reputation, becoming one of the UK's leading cutlery companies. The knives make it possible to satisfy culinary arts enthusiasts, professionals or amateurs. Innovative, the Richardson Sheffield brand is constantly developing new knives using the best technologies.