A necessary facet of knife ownership is edge maintenance and regular honing with a Zwilling J.A. Henckels 12" Diamond Sharpening Steel will keep your knives sharp for years to come. Forged from German stainless steel and coated with diamond, the Zwilling J.A. Henckels Diamond Sharpening Steel is one of the best sharpening steels on the market. It is guaranteed by Zwilling J.A. Henckels to be free from material or craftsmanship mistakes.