Restore your knives’ precision edges with regular monthly use of the 12″ Diamond Sharpening Steel by Mundial. More durable with more precision, thanks to the diamond coating. Keeps knives at their best so your prepping is easy and efficient. Diamond steels will actually remove metal from the knife blade. The steel will quickly put an edge on a knife that cannot be sharpened with a regular steel. Diamond steel offers flat sides that catch the small particles removed from knife blade during sharpening.