The Ultra-Tek handle is made of 6060-T6 anodized aircraft aluminum. Stored inside the handle is a 600-grit, diamond-coated oval shaft. Simply unscrew the shaft from the handle interior, turn it around, and screw it on to the other end of the handle. Now the Ultra-Tek is a comfortable 9-in. length, ideal for both sharpening and realigning the edge of your Kershaw blade. To sharpen, hold the blade edge against the diamond-coated shaft at about a 20-degree angle and swipe the blade, from heel to tip, along the sharpening shaft. Do this an even number of times on both sides of the blade. Soon, your blade will be restored to its Kershaw shaving sharp edge. It's a good idea to keep the Ultra-Tek close at hand so you can touch up the blade from time to time. If you don't let it get terribly dull, it will take no time at all to maintain your edge. The Ultra-Tek requires no water or oil. It's lightweight and easy to use. And it stores compactly, making it easy to take with you.