Sharpening stones basically come in two types, individual slabs and systems. A traditional sharpening stone sits flat on the bench top, requiring you to maintain a consistent angle as you draw the blade along the slab. There are exceptions, but generally speaking a hunting knife is best sharpened with the blade held anywhere from about a 22- to a 30-degree angle off the stone. The wider the angle, the more difficult it is to achieve a razor edge, but the more durable the hone. Commercial sharpening systems hold the stone at a predefined, optimal angle to ensure you get the perfect edge every time.