This Kai Sharpener offers a fully electric design for quickly maintaining all of your kitchen knives. It automatically set the sharpening angle to the correct 16-degree for any Shun or Kai double beveled knife. Please read user instructions before use. Features: Automatically sets sharpening angles to provide a precision edge. Sharpens and finishes both sides of the blade. Long-lasting sharpening stones. Very easy to use and clean.