Japanese water stones are an efficient and effective tool for keeping your knives sharp. Using just a few drops of water (no soaking necessary), your knives will be sharp in a matter of minutes - no oil necessary. This Kramer by ZWILLING set features a coarse 400-grit glass stone for dull knives or for reshaping blades, a finer 1,000-grit glass stone for honing, and a 5000-grit glass stone for finishing touches. The bamboo sharpening stone sink bridge holds the stones when in use. Also included in this set is the easy-to-follow Sharpening Instructional DVD by master bladesmith Bob Kramer.