This Great little DIAMOND POCKET Sharpener by Gerber carries a Limited Lifetime Warranty and is easy to use. Simply position fingers behind the finger guard and hold the knife at a 90-degree angle to the sharpener. Pull the blade back lightly in straight, even strokes. Start with the course rods to remove blade imperfections. Flip sharpener over to use the fine rods for final honing of the blade. Instructions included. Features Medium and Fine Diamond Rods.