This Serrated Knife Hone model works with Gatco Sharpening systems and offers a medium grade. The serrated knife hone was designed to sharpen serrated blades, electric knives, fillet and carving blades. Gatco uses only the finest materials for their sharpening instruments to meet strict industrial standards. The Serrated Knife Hone works with Gatco Sharpening systems 10003, 10004, 10005, and 10006.