The ultimate knife sharpener. This diamond hone knife block sharpening stone makes tool, blade, and knife sharpening almost effortless. The 4-sided diamond hone block has a different grit on each face, ranging from extra coarse (200 grit) to fine (600 grit). Each of the 4 sides of the hone sharpener has three layers of diamonds that are nickel bonded to the steel frame. The hone block fits into a hard plastic case with rubber pads on the bottom that prevents slippage during sharpening. Oil is not required for this sharpening hone block. Water in a spray bottle is all you need to make your sharpening smooth, clean, and effortless.