Master Grade knife sharpeners were designed by an engineer and practitioner in the knife industry. The benefit of his experience is transferred by technology and modern manufacturing to the final user in the form of these high-quality sharpeners. Master Grade offers a unique feature in the commercial model, a flexible sharpening wheel that is unlike the conventional stone wheeled units which tend to overheat and grind away blades. Users will be delighted with this innovative sharpener which produces a razor sharp edge in just seconds, the clean edge just like new. Master Grade is the only OUTDOOR sharpener on the market. It is designed to help new users to perfect their knife sharpening skills in no time. You can take it with you during your outdoor activities and solve sharpening needs on the spot. Sharp knives mean less injury in the field.