The Victorinox 10 inch Diamond Sharpening Steel by Victorinox has a hollow oval diamond steel and a plastic handle. It is made in Sheffield, England exclusively for Victorinox. Diamond steels should be used with caution, as they actually remove metal from the knife blade, rather than realigning the rolled over edge (which is how regular steels work). Diamond steels can quickly put an edge on a knife that cannot be sharpened with a regular steel. When selecting a steel, choose one that is 2 inches longer than the knife you wish to sharpen.