Kershaw 2535 Ultra-Tek Sharpener. The Kershaw Ultra-Tek Sharpener features a 3.75" 600 grit, diamond coated oval shaft. This compact sharpening rod is the perfect sharpener for sportsman, hunters, backpackers, and fishermen. Handle is black anodized 6061-T6 aircraft aluminum. Overall length: 9.5", Weight: 2.0 oz. Lifetime Guarantee.