Just like any knife, these multi-purpose knives are handy and helpful tools for different uses. To keep their best cutting performance, use a sharpening product such as sharpening stone or steel.

Lay upper portion of blade's sharp edge against surface of the whetstone, near its left end. Tilt blade 20 degrees, with sharp edge in contact with the stone. Slide sharp edge to right, across the stone, applying pressure with help from your free hand.