Knife Sharpener Sharpening Stone Kitchen 4 Sided Diamond Hone System Sharpen Steel Whetstone New Three layers of diamond stones on each of the four sides nickel bonded to a steel frame. No oil is required. Simply use a spray bottle of water during sharpening. Four levels of coarseness: (600) Fine, (400) Medium, (300) Coarse, (200) Extra Coarse Shavings fall into openings on the surface of the sharpener to help maintain a cleaner surface Excellent for sharpeing scissors, tools, knives, and any other type of blade.