The first responder for field maintenance on all types of knife blades using a Tungsten Carbide, Ceramic Sharpening Rod (1,000 grit), Serrated Knife Sharpener, or a Diamond Tapered Rod (600 grit). This sharpener comes conveniently packaged in a clam shell case. Ceramic Sharpening Rod (1,000 grit), Serrated Knife Sharpener, or a Diamond Tapered Rod (600 grit) Keep it with you at all times for either fast blade maintenance Packaged in a clam shell case