Lansky Quick Edge Sharpener Get a razor sharp edge in seconds with the Quick Edge Knife Sharpener. Tungsten Carbide cutting heads for precision sharpening. Just three or four strokes and it's sharp! The secret is a precision V-shaped tungsten carbide sharpening element in the head of the sharpener. Designed with an ergonomic grip, finger guard and thumb rest, the Quick Edge Knife Sharpener is both safe and comfortable to use right-handed or left-handed.