Ergonomic Design: Our diamond steel knife sharpener has a 2-stage sharpening system that can sharpen your knives to full sharpness. The first stage of diamond sharpening repairs and straightens the blades damagedand the second step restores and polishes cleanly. Our world's best knife sharpener is also designed with comfort in mind: the quality suction cup on the bottom offers a Easy, safe and universal use: Our knife sharpener kit with diamond, ceramic, tungsten, easy to use. Simply place the knife in the sharpening slot and enjoy your new sharpening in seconds. He isalso safe to use and works. including "hard" steel knives. (Be careful not to pull back and forth, it will damage the knife sharpener) Tungsten Carbide - Top Quality in Every Way Our quality of tungsten is higher than that used by most competitors. It offers the hardness capable of bringing a sharp edge to the hardest steel knives, and effective resistance for a lifetime. Only the occasional passageof this slot when your knives are dull is necessary to bring back a bright edge. Ceramic rods - Re-align the burr As we use our knives, the cutting edge will look dull after even a few uses due to a bend in the top of the knife called a burr. The ceramic rods are designed to straighten the edge of the knife andremove the burr, returning your knife to optimum sharpness. Ceramic rods will realign, polish and straighten minors. imperfections along the edge of the knife. If used regularly you will increase the longevity of your knives giving you a sharp and safe set of knives with the potential to last a lifetime. Content: 1 electric pencil sharpener. 1 x replace grinding disc.