RPT-Kinetics Knife Sharpener The best knife sharpener for all your Kitchen, Santoku, Hunting, & Pocket Knives. Made in the USA! Simple 3 step process allows for even an amateur to achieve the quality of a professionally sharpened knife. Utilizes Reverse Polarity Technology to produce an extremely sharp and burr free edge that extends the life of all your favorite knives. Sharpens both straight edge and serrated knives (this requires a soft touch); it isnt designed to sharpen ceramic knives. Unlike most electric knife sharpeners, RPT-Kinetics Knife Sharpener can be used both in the kitchen AND while you're hunting in the field.