QUALITY MATERIAL: Made with ceramic inserts to last longer SHARPENING GUIDE: Designed to train users to hold a knife at the proper angle when sharpening KNIFE RESTORATION: The easiest and most accurate sharpening guide available, creating an ideal sharpening angle for ultimate knife performance and peak sharpness BEST USE: For use with 6" Chef's Knives and larger MERCER CULINARY: Mercer continues to introduce innovative, quality products allowing foodservice operations to run effectively and efficiently; perfect for professional use or the home cooking enthusiast