Chef's Garage 2 Slot Kitchen Knife Sharpener with Diamond Coated Wheel - for Straight and Serrated Knives (Black) If you want to restore the sharpness of old knives then “Chef’s Garage” is the perfect choice. It has two wheels (sharpening section) – both of which help to sharpen your dull knife. First Wheel is diamond coated coarse sharpening section. This wheel provides a double edge finish which will last much longer than the current one. It is actually titled slightly at an angle so that when the knife is pulled, the edges will be sharpened each side of the knife. And the second wheel is known as ceramic system which is designed to sharpen the knife. Apart from that, it also repairs small nicks and imperfections present on the edge of the knife. This is section is also suitable for sharpening serrated knives.Key Features:Very easy to use.Non-slip base for added stability and control.Its ergonomic design provides utmost comfort and easy grip.Small in size 20 x 7 x 7 cms.Weights less - 250 gramsHow Does It Work ?Insert the blade in the first slot a diamond coated wheel (Also known as coarse slot black in color) to shape the angle of your knife's blade.Pull the knife straight back towards approximately 10 times.The second ceramic honing wheel (Also known fine slot white in color) polishes your knife revealing a smooth, clean blade from spine to the edge of knife.Pull the knife straight back towards approximately 10 times.If blade is still dull repeat these steps until blade is sharp.