Chroma #800 Whetstone Knife Sharpener type 301 by F. A. Porsche
Type 301 whetstone sharpening tool The knife should be sharpened daily (for professional cooks) or about every six months (for hobby cooks), and by the same person each time. Each person has an individual angle at which he or she sharpens the knife. The blade of the knife becomes sharper each time it is sharpened in the same manner, by the same person. Read the instructions included with your whetstone carefully Only use wooden or plastic cutting boards, never marble or glass when cutting with a Type 301.