Diamond Knife Sharpener #100. 12" long, great for shop, skinning shack, or kitchen. Sharpen your knife without expending any effort. Easy to use, durable and lightweight. Smooth as silk blade is constructed with a layer of electroplated nickel on a tubular steel rod, then embedded on microcrystalline industrial diamonds to give you a crisp cutting edge. Oval sharpening surface provides more sharpening area than round surfaces.