Certified as a Master Bladesmith by the American Bladesmith Society, Bob Kramer is one of the only Master Bladesmiths in the world specializing in kitchen cutlery. Put simply, Kramer is King of the Kitchen Knife. As such, Bob Kramer has seen the knife from every angle-as a chef, a professional knife sharpener, and a Master Bladesmith. Although he is most widely recognized for his blades, Bob is also an expert on sharpening. In that spirit, he has collaborated with ZWILLING to create the KRAMER by ZWILLING sharpening collection. This assortment offers a sharpening and polishing option to fit every skill level, along with accessories to help maintain these critical tools for years to come. In order to maximize the performance of any knife, it is very important that the edge be properly cared for. Retooling your knives' edges by hand may seem daunting to a beginner, but with Kramer's help many describe the experience as relaxing and gratifying. Keeping your blades sharp not only makes the cook's most important tool easier to use, sharpening makes knives safer. This premium collection is designed to meet Bob Kramer's rigorous expectations for quality. Each piece in the collection plays an important role in ensuring the life of your blades:• Sharpening Stone #400 grit for repairing or changing the edge• Sharpening Stone #1000 grit for fine sharpening• Sharpening Stone #5000 grit for extra fine finishing and polishing• Adjustable Bamboo Whetstone Sink Bridge creates a sturdy workstation for sharpening• Cleaning Stone to polish the water stones to return them to like-new condition• Instructional DVD is the definitive guide on how to sharpen from Kramer himself, only available as part of the set Set is not for use on ceramic knives. Made in Japan.