Combination Japanese Twin Water Stone Pro

7.5" x 2.5" x "2Coarse 250-grit stone for dull bladesFine 1,000-grit stone for putting on a sharp edgeNo oil required Non slip base for safe sharpening Japanese water stones are an efficient and effective tool for keeping you knives sharp. Using just a few drops of water (no pre-soaking required), your knives will be sharp in a matter of minutes - no oil necessary. This TWIN Pro 250/1000 Combination Japanese Water Stone has two sides, a coarse 250 grit stone for especially dull knives or reshaping blades, and a fine 1,000 grit stone for the finishing touches. The base has non-slip rubber feet so you can safely sharpen your knives on most surfaces.