Chef'sChoice 120 EdgeSelect Diamond Hone Professional Knife Sharpener for Straight and Serrated Knives with Precision Angle Control, 3-Stage, made in USA, Brushed Metal Three-stage precision sharpening Works for gourmet chef's knives, butcher knives, sporting knives, serrated knives 100 percent diamond abrasive will never detemper Unique Trizor-Plus edge provides greater sharpness and durability Three-year household warranty