This Fine Serrated Hone model works with Gatco Sharpening systems and offers a 800 grit grade. The Fine Serrated hone was designed for sharpening all serrated blades, electric knives, filet knives, and carving blades. Gatco uses only the finest materials for their sharpening instruments to meet strict industrial standards. The Fine Serrated Hone works with Gatco Sharpening systems 10003, 10004, and 10005.