Three-step sharpening process (coarse, medium, fine), you can get each knife super sharp according to the degree of wear. The first location is reserved for scissors. Slots 2,3,4 are then for coarse grinding, fine grinding and polishing, it is a fine cutting edge to make each blade dull to sharp. Materials used for manual knife sharpeners are: tungsten carbon steel, ceramic stone, diamond shanks The main body of the shiny sharpener is made of strong and light ABS plastic The handle is comfortable and wide, so no difficulty in keeping it stabilized and in place with ease. Simply pull the knives through the appropriate notch several times and after a few seconds even the old dull knives are like new (please do not sharpen back and forth). The handle is ergonomically shaped for a Maximum grip with a sleek black / chrome finish, and suitable for left and right handed users. Non-slip rubber base provides ultimate stability and security, preventing the scissor sharpener from slipping. Quickly and easily sharpens most ceramic steel knives, use it on any flat surface of the kitchen, including wood, stone or glass worktops. Professional sharpener is extremely efficient and durable, for use with straight edge steel kitchen knives, scissors and large serrated knives (bread knives) including knives with hardened steel blades. Use it at home, outdoors, or even on the road while camping.