PLAIN … Before Spyderco ever made knives, we manufactured the tools to keep them sharp. Spyderco’s Tri-Angle Sharpmaker takes the mystery out of this process and enables anyone to sharpen a knife effectively with just a few minutes practice. Basic Step By Step Instructions on Sharpening With The Sharpmaker Place brown stones with the corners facing inward in 40 degree slot Place brass hand guards in appropriate holes Hold knife straight up and down and stroke edge of the knife in a downward motion from heel to tip on one of the stones. Sharpening Serrated Knife Blades Spyderco Sharpmaker - YouTube Spyderco’s Tri-Angle Sharpmaker takes the mystery out of this process and enables anyone to sharpen a knife effectively with just a few minutes practice. Spyderco's state-of-the-art sharpening system and accessories can help give you the edge you need. Be sure that 204 and tool to be sharpened are both clean (for instructions on how to clean your 204, please see section titled 'Cleaning Your Tri-Angle Sharpmaker"). Its durable ABS plastic base contains keyed holes that accurately set the stones’ sharpening angles at a 30° (15° each side) or 40° (20° each side) for sharpening knives. Spverco KNIFE SHARPENING Remember: Use both safety rods, keeping hand behind and below rods. Its durable ABS plastic base contains keyed holes that accurately set the stones’ sharpening angles at a 30° (15° each side) or 40° (20° each side) for sharpening knives.