Gatco Medium Serrated Knife Hone. 350/400 grit triangular hone. Restores dull serrated blades to full cutting performance. Sharpens all serrated blades, electric knives, fillet and carving blades. For use with GATCO® Knife Sharpening Systems 10003, 10004, 10005 and 10006. Hang packaged. (CHINA)