Pro 250/1000 Combination Japanese Water StoneJapanese water stones are an efficient and effective tool for keeping your 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