Chef&rsquo;sChoice Pronto 463 Diamond Hone for Santoku 15-degree Knives Highly Recommended Ranked Best Manual Sharpener for 15-degree Knives by Cook&rsquo;s Illustrated Extremely Fast Sharpening, 2-Stage, Red Fastest manual sharpener on the market: first stage sharpens, second stage hones and polishes Diamond abrasives are used in both stages: diamond wheels hold their shape, can sharpen any alloy, and there is no need to use messy water or oil while sharpening Precise bevel angle control for an ultra sharp 15-degree asian style edge For straight and serrated santoku and other double-bevel asian style knives Can be used left or right handed, Soft touch handle provides easy and secure grip