Here is a durable, all-purpose utility knife featuring a Japanese stainless steel blade and unbreakable PP plastic handle. The 90mm blade takes an excellent edge, hardened to 57-59HRC it has a final honing on a leather strop before leaving the factory. The PP plastic sheath features a unique method for attaching around a button on your work clothes, which means it does not loosen, but is easy to remove. The sheath fits just as well on your belt as on your buttons. If your belt is thick, cut away the small pin on the cover.