DESC: Two (2) sharpening stages, sharpening and honing, to create a razor sharp arched shaped, double-bevel edge that is stronger and stays sharp longer. 100 % diamond abrasives , the hardest known substance, sharpen any blade faster and more efficiently than conventional abrasives. Precision roller guides control the angleon each stroketo ensurerazor-sharpedges every time - eliminates all guesswork. Very easy and safe to use. Safe for use with quality knives Use right-or-left handed (Ambidextrous) .