The Naniwa EBI #400 diamond stone is a professional sharpening stone designed for roughing, reshaping edges, and flattening cutting tools. Its #400 grit and high-performance diamond abrasive effectively sharpen knives, chisels, Japanese planes, and the hardest steels.

Its 1 mm sintered diamond surface offers excellent longevity and consistent abrasion while limiting the risk of detachment. Usable simply with water, without soaking, this stone comes with a dressing stone to maintain optimal performance.