Camillus Extreme Edge Knife & Shear Sharpener because a dull knife is a dangerous knife. A suction cup located on the bottom helps secure the sharpener to flat, clean surfaces and provides safe & easy one-handed sharpening. Incorporates a Carbide Knife Sharpener and a Ceramic Shear Sharpener. This easily portable sharpener is ideal for home, office, or camp use. Lifetime Warranty.