The Naniwa EBI #400 diamond stone is a professional sharpening stone designed for coarse grinding, re-edging, and angle correction on knives, chisels, Japanese planes, and other cutting tools. Its #400 grit and diamond abrasive provide high cutting capacity, even on the hardest steels and difficult-to-machine materials.

Its 1 mm sintered diamond surface ensures excellent durability and consistent abrasion over time. Usable simply with water, without soaking, it comes with a dressing stone to maintain a perfectly flat surface.