The Ultra-Tek Blade Sharpener is the convenient way to keep your knife sharp. The Ultra-Tek is a compact sharpening steel that lets you quickly and easily touch up the edge on your Kershaw anywhere, anytime. The Ultra-Tek handle is made of 6061-T6 anodized aircraft aluminum. Stored inside the handle is a 600-grit, diamond-coated oval shaft. This is the perfect grit for restoring an edge that is in generally decent shape but is just dull. Simply unscrew the shaft from the handle interior, turn it around, and screw it on to the other end of the handle. The Ultra-Tek requires no water or oil. It's lightweight and easy to use.