Learn how to use a diamond knife sharpener by simply reading the back of the product package. Yes, it's that simple. A pocket knife sharpening stone adds years of additional use to your essential survival tool. Save money on cutlery by learning how to sharpen a knife. Remember, the grind is all about angle and force applied. The lesser the angle, the sharper the blade will become, but less force must be applied in order to prevent chipping or wearing out the blade even more.