Lansky Natural Arkansas Sharpening LKNATSystem. Includes one each of the following Arkansas Sharpening stones: soft (300 grit equivalent), hard (650 grit equivalent) and black hard (1,200 grit equivalent). Sharpening system comes with precision multi angle, flip over knife clamp with rubber padded jaws to prevent scratching; sharpening stones on color coded fingergrooved safety holders; one guide rod for each stone; specially formulated honing oil and extra long knife clamp screws.